I've collected all the Dragons available (or not) in Dragon City. Hope it will help someone.
black - available / red - unavailable
1000-Nature Dragon
1001-Firebird Dragon
1002-Mercury Dragon
1003-Gummy Dragon
1004-Lantern Fish Dragon
1005-Tropical Dragon
1006-Zombie Dragon
1007-Petroleum Dragon
1008-Dandelion Dragon
1009-Jade Dragon
1010-Star Dragon
1011-Terra Dragon
1012-Flaming rock Dragon
1013-Armadillo Dragon
1014-Cloud Dragon
1015-Laser Dragon
1016-Mud Dragon
1017-Nenufar Dragon
1018-Hedgehog Dragon
1019-Icecube Dragon
1020-Flame Dragon
1021-Neon Dragon
1022-Pearl Dragon
1023-Cool Fire Dragon
1024-Medieval Dragon
1025-Penguin Dragon
1026-Ice Dragon
1028-Carnivore Plant Dragon
1029-Fluorescent Dragon
1031-Electric Dragon
1032-Battery Dragon
1033-Sea Dragon
1039-Metal Dragon
1040-Dark Dragon
1041-Legendary Dragon
1042-Vampire Dragon
1043-Alpine Dragon
1044-Poo Dragon
1045-Volcano Dragon
1046-Blizzard Dragon
1047-Rattlesnake Dragon
1048-Gold Dragon
1049-Soccer Dragon
1050-Platinum Dragon
1051-Pirate Dragon
1052-Crystal Dragon
1053-Wind Dragon
1054-Mirror Dragon
1055-Coral Dragon
1056-Spicy Dragon
1057-Waterfall Dragon
1058-Cactus Dragon
1059-Storm Dragon
1060-Ice Cream Dragon
1061-Mojito Dragon
1062-Chameleon Dragon
1063-Hot Metal Dragon
1064-Snowflake Dragon
1065-Seashell Dragon
1066-Moose Dragon
1067-Dragonfly Dragon
1068-Venom Dragon
1069-Steampunk Dragon
1070-Dark Fire Dragon
1071-Butterfly Dragon
1072-Robot Dragon
1073-Pure Terra Dragon
1074-Pure Flame Dragon
1075-Pure Sea Dragon
1076-Pure Nature Dragon
1077-Pure Electric Dragon
1078-Pure Ice Dragon
1079-Pure Metal Dragon
1080-Pure Dark Dragon
1081-Pure Dragon
1082-Paladin Dragon
1083-Fossil Dragon
1084-Seahorse Dragon
1085-Sky Dragon
1086-Bat Dragon
1087-Aztec Dragon
1088-Chinese Dragon
1089-King Dragon
1090-Wizard Dragon
1091-Two headed Dragon
1092-Plankton Dragon
1093-Uncle Sam Dragon
1094-Evil Pumpkin Dragon
1095-Viking Dragon
1096-Jelly Dragon
1097-Quetzal Dragon
1098-Queen Dragon
1099-Thanksgiving Dragon
1100-Santa Dragon
1101-Ghost Dragon
1102-Deep Forest Dragon
1103-Ninja Dragon
1104-Ice&Fire Dragon
1105-Aurora Dragon
1106-Music Dragon
1107-Block Dragon
1108-Butterfly Dragon
1109-Alien Dragon
1110-Great White Dragon
1111-Pharaoh Dragon
1112-Paradise Dragon
1113-Gaudi Dragon
1114-Cool Fire Dragon
1115-Octopus Dragon
1116-Jellyfish Dragon
1117-Carnival Dragon
1118-Love Dragon
1119-Dujur Dragon
1120-T-Rex Dragon
1121-Brontosaurus Dragon
1122-Hydra Dragon
1123-Mars Dragon
1124-Prisma Dragon
1125-Centipede Dragon
1126-Emerald Dragon
1127-St Patrick's Dragon
1128-Ruby Dragon
1129-Angry Dragon
1130-Lava Dragon
1131-Joker Dragon
1132-Chainmail Dragon
1133-Sphynx Dragon
1134-Mummy Dragon
1135-Diamond Dragon
1136-Demon Dragon
1137-Gargoyle Dragon
1138-Deep Red Dragon
1139-Blue Dragon
1140-Archangel Dragon
1141-Lightning Dragon
1142-Ancient Dragon
1143-Wurm Dragon
1144-Light Dragon Test
1145-War Dragon Test
1146-Eternal Dragon Test
1147-Glacial Dragon
1148-Cerberus Dragon
1149-Burning Dragon
1150-Treasure Dragon
1151-Granite Dragon
1152-Bone Dragon
1153-Wyvern Dragon
1154-Predator Dragon
1155-Poseidon Dragon
1156-Hades Dragon
1157-Atlas Dragon
1158-Justice Dragon
1159-Sun Dragon
1160-Gaia Dragon
1161-Luminsicent Dragon
1162-Rainbow Dragon
1163-War Dragon
1164-Juggernaut Dragon
1165-Colossal Dragon
1166-Red Woods Dragon
1167-Leviathan Dragon
1168-Panzer Dragon
1169-Nirobi
1170-Droconos
1171-Monstruous Dragon
1172-Ivory Dragon
1173-Moon Dragon
1174-Toxic Dragon
1175-Obsidian Dragon
1176-Meteor Dragon
1177-Hammer Dragon
1178-Tribal Dragon
1179-Origami Dragon
1180-Tiny Dragon
1182-Thor Dragon
1183-Loki Dragon
1184-Odin Dragon
1185-Fallen Angel Dragon
1186-Cold Star Dragon
1187-Photon Dragon
1188-Elfic Dragon
1189-Zen Dragon
1190-Tesla Dragon
1191-Kratus Dragon
1192-Saturn Dragon
1193-Dark Stone Dragon
1194-White Knight Dragon
1195-Black Knight Dragon
1196-Thief Dragon
1197-Deus Pet Dragon
1198-Midas Dragon
1199-Kryptonite Dragon
1200-Aquamarine Dragon
1201-Blue Fire Dragon
1202-Hypno Dragon
1203-Stressed Dragon
1204-Troglodyte Dragon
1205-Mould Dragon
1206-Vegan Dragon
1207-Rockfeller Dragon
1208-King Solomon Dragon
1209-Scrooge Dragon
1210-Robin Hood Dragon
1211-Wrestler Dragon
1212-Clover Dragon
1213-Fortune Cookie Dragon
1214-Poker Dragon
1215-Juggler Dragon
1216-Ace Dragon
1217-Speed Dragon
1218-Strong Dragon
1219-Endurane Dragon
1220-Wisdom Dragon
1221-Master Dragon
1222-Big Claws Dragon
1223-Chimera Dragon
1224-Eclipse Dragon
1225-Specter Dragon
1226-Cat Dragon
1227-Crossfire Dragon
1228-Green Fluid Dragon
1229-Frozen Wind Dragon
1230-Canadian Guard Dragon
1231-Aztec Warrior Dragon
1232-Aztec Priest Dragon
1233-Aztec Emperor Dragon
1234-Kaleidoscope Dragon
1235-X-Gen Dragon
1236-Flea Dragon
1237-Frightened Dragon
1238-Ocean Dragon
1239-Kiss Dragon
1240-Kelbin Dragon
1241-Storyteller Dragon
1242-Emo Dragon
1243-Horizon Dragon
1244-Magnetic Dragon
1245-Frostfire Dragon
1246-Pure White Dragon
1247-Pure Black Dragon
1248-Vegan Dragon
1249-Hippie Dragon
1250-Bejeweled Dragon
1251-Refracted Dragon
1252-Atila Dragon
1253-Twitter Dragon
1254-Facebook Dragon
1255-Pachamama Dragon
1256-Orphan Dragon
1257-Alchemist Dragon
1258-Jackpot Dragon
1259-Target Dragon
1260-Chobby Dragon
1261-Albino Dragon
1262-Jamaican Dragon
1263-Chocolate Dragon
1264-Blind Dragon
1265-Elements Dragon
1266-Manglar Dragon
1267-Giant Wings Dragon
1268-Amethyst Dragon
1269-Peace Dragon
1270-Desert Dragon
1271-Hearth Dragon
1272-Hairy Dragon
1273-Twister Dragon
1274-Sylvan Dragon
1275-Tatoo Dragon
1276-Sylvan Dragon
1277-Secret Earth Dragon
1278-Secret Flame Dragon
1279-Secret Sea Dragon
1280-Secret Plant Dragon
1281-Secret Ice Dragon
1282-Cosmo Dragon
1283-Columbus Dragon
1284-Bavarian Dragon
1285-Rock Star Dragon
1286-Frankie Dragon
1287-Halloween Dragon
1288-Animation Dragon
1289-Joseon Dragon
1290-Emperor Dragon
1291-Oni Dragon
1292-Hearts Queen Dragon
1293-Big Hat Dragon
1294-Quartz Dragon
1295-Dark Elf Dragon
1296-Sunset Dragon
1297-Snowman Dragon
1298-Xmas Elf Dragon
1299-Necromancer Dragon
1300-Middle Earth Dragon
1301-Shogun Dragon
1302-Marital Arts Dragon
1304-Hawaiian Dragon
1305-Surf Dragon
1306-Ukulele Dragon
1307-Steam Dragon
1308-Howl Dragon
1309-Magnet Dragon
1310-Quake Dragon
1311-Apocalypse Dragon
1312-Millenium Dragon
1313-Forge Dragon
1314-Promethium Dragon
1315-Abyss Dragon
1316-Mirage Dragon
1317-Supersonic Dragon
1318-Core Dragon
1319-Basilisk Dragon
1320-Dolphin Dragon
1321-Easter Dragon
1322-Book Day Dragon
1323-Lightbeam Dragon
1324-Double Terra Dragon
1325-Earth Day Dragon
1326-Double Nature Dragon
1327-Double Flame Dragon
1328-Double Electric Dragon
1329-Double Ice Dragon
1330-Double Metal Dragon
1331-Double Sea Dragon
1332-Mother’s Day Dragon
1333-Felidae Dragon
1334-Space Dragon
1336-Kaiju Dragon
1337-Acustic Dragon
1338-Unity Dragon
1339-Anniversary Dragon
1341-Cheshire Cat Dragon
1342-Pterodactyl Dragon
1350-Zodiac Taurus Dragon
1351-Zodiac Aries Dragon
1352-Zodiac Gemini Dragon
1353-Zodiac Cancer Dragon
1354-Zodiac Leo Dragon
1355-Zodiac Virgo Dragon
1356-Zodiac Libra Dragon
1357-Zodiac Scorpio Dragon
1358-Zodiac Sagittarius Dragon
1359-Zodiac Capricorn Dragon
1360-Zodiac Aquarius Dragon
1361-Zodiac Pisces Dragon
1362-O Rei Dragon
1363-Ney Dragon
1364-Pelusa Dragon
1365-Pulga Dragon
1366-Orange Dragon
1367-Inesta Dragon
1368-Ranoldo Dragon
1369-Zizou Dragon
1370-Father’s Day Dragon
1371-Rapunzel Dragon
1372-Little Red Riding Hood Dragon
1373-Adventure Dragon
1374-Cyborg Dragon
1375-Da Vinci Dragon
1376-Korean Soccer Dragon
1377-Independence Day Dragon
1378-Genie Dragon
1379-Shaolin Dragon
1380-Sorcerer (Witcher) Dragon
1381-Hellgate
1382-Albino Dragon
1383-Gold Rush Dragon
1384-Apache Dragon
1385-Sheriff Dragon
1386-Mozart Dragon
1387-Hansel&Gretel
1388-Detective Dragon
1389-Astronaut Dragon
1390-Brave Sword Dragon
1391-Scientific Dragon
1392-Red Egg Dragon
1393-Mystic Tribe Dragon
1394-Nocturnal Dragon
1395-Flying Chest
1396-Dragoonie Dragon
1397-Longhorn Dragon
1398-Sleeping Beauty Dragon
1399-Mystic Plant Dragon
1400-Explosive Dragon
1401-Necro Dragon
1402-Allure Dragon
1403-Sad Dragon
1406-Krait Dragon
1407-Golem Dragon
1408-Ragnor Dragon
1409-Dark Angel Dragon
1410-Deus Advisor
1411-Mystic Blizzard Dragon
1412-Water Storm Dragon
1413-Adamantium Dragon
1414-Citadel Dragon
1415-Mystic War Dragon
1416-Greddy Dragon
1417-Secret Fire Dragon
1418-Secret Earth Dragon
1419-Porcelain Dragon
1000-Nature Dragon
1001-Firebird Dragon
1002-Mercury Dragon
1003-Gummy Dragon
1004-Lantern Fish Dragon
1005-Tropical Dragon
1006-Zombie Dragon
1007-Petroleum Dragon
1008-Dandelion Dragon
1009-Jade Dragon
1010-Star Dragon
1011-Terra Dragon
1012-Flaming rock Dragon
1013-Armadillo Dragon
1014-Cloud Dragon
1015-Laser Dragon
1016-Mud Dragon
1017-Nenufar Dragon
1018-Hedgehog Dragon
1019-Icecube Dragon
1020-Flame Dragon
1021-Neon Dragon
1022-Pearl Dragon
1023-Cool Fire Dragon
1024-Medieval Dragon
1025-Penguin Dragon
1026-Ice Dragon
1028-Carnivore Plant Dragon
1029-Fluorescent Dragon
1031-Electric Dragon
1032-Battery Dragon
1033-Sea Dragon
1039-Metal Dragon
1040-Dark Dragon
1041-Legendary Dragon
1042-Vampire Dragon
1043-Alpine Dragon
1044-Poo Dragon
1045-Volcano Dragon
1046-Blizzard Dragon
1047-Rattlesnake Dragon
1048-Gold Dragon
1049-Soccer Dragon
1050-Platinum Dragon
1051-Pirate Dragon
1052-Crystal Dragon
1053-Wind Dragon
1054-Mirror Dragon
1055-Coral Dragon
1056-Spicy Dragon
1057-Waterfall Dragon
1058-Cactus Dragon
1059-Storm Dragon
1060-Ice Cream Dragon
1061-Mojito Dragon
1062-Chameleon Dragon
1063-Hot Metal Dragon
1064-Snowflake Dragon
1065-Seashell Dragon
1066-Moose Dragon
1067-Dragonfly Dragon
1068-Venom Dragon
1069-Steampunk Dragon
1070-Dark Fire Dragon
1071-Butterfly Dragon
1072-Robot Dragon
1073-Pure Terra Dragon
1074-Pure Flame Dragon
1075-Pure Sea Dragon
1076-Pure Nature Dragon
1077-Pure Electric Dragon
1078-Pure Ice Dragon
1079-Pure Metal Dragon
1080-Pure Dark Dragon
1081-Pure Dragon
1082-Paladin Dragon
1083-Fossil Dragon
1084-Seahorse Dragon
1085-Sky Dragon
1086-Bat Dragon
1087-Aztec Dragon
1088-Chinese Dragon
1089-King Dragon
1090-Wizard Dragon
1091-Two headed Dragon
1092-Plankton Dragon
1093-Uncle Sam Dragon
1094-Evil Pumpkin Dragon
1095-Viking Dragon
1096-Jelly Dragon
1097-Quetzal Dragon
1098-Queen Dragon
1099-Thanksgiving Dragon
1100-Santa Dragon
1101-Ghost Dragon
1102-Deep Forest Dragon
1103-Ninja Dragon
1104-Ice&Fire Dragon
1105-Aurora Dragon
1106-Music Dragon
1107-Block Dragon
1108-Butterfly Dragon
1109-Alien Dragon
1110-Great White Dragon
1111-Pharaoh Dragon
1112-Paradise Dragon
1113-Gaudi Dragon
1114-Cool Fire Dragon
1115-Octopus Dragon
1116-Jellyfish Dragon
1117-Carnival Dragon
1118-Love Dragon
1119-Dujur Dragon
1120-T-Rex Dragon
1121-Brontosaurus Dragon
1122-Hydra Dragon
1123-Mars Dragon
1124-Prisma Dragon
1125-Centipede Dragon
1126-Emerald Dragon
1127-St Patrick's Dragon
1128-Ruby Dragon
1129-Angry Dragon
1130-Lava Dragon
1131-Joker Dragon
1132-Chainmail Dragon
1133-Sphynx Dragon
1134-Mummy Dragon
1135-Diamond Dragon
1136-Demon Dragon
1137-Gargoyle Dragon
1138-Deep Red Dragon
1139-Blue Dragon
1140-Archangel Dragon
1141-Lightning Dragon
1142-Ancient Dragon
1143-Wurm Dragon
1144-Light Dragon Test
1145-War Dragon Test
1146-Eternal Dragon Test
1147-Glacial Dragon
1148-Cerberus Dragon
1149-Burning Dragon
1150-Treasure Dragon
1151-Granite Dragon
1152-Bone Dragon
1153-Wyvern Dragon
1154-Predator Dragon
1155-Poseidon Dragon
1156-Hades Dragon
1157-Atlas Dragon
1158-Justice Dragon
1159-Sun Dragon
1160-Gaia Dragon
1161-Luminsicent Dragon
1162-Rainbow Dragon
1163-War Dragon
1164-Juggernaut Dragon
1165-Colossal Dragon
1166-Red Woods Dragon
1167-Leviathan Dragon
1168-Panzer Dragon
1169-Nirobi
1170-Droconos
1171-Monstruous Dragon
1172-Ivory Dragon
1173-Moon Dragon
1174-Toxic Dragon
1175-Obsidian Dragon
1176-Meteor Dragon
1177-Hammer Dragon
1178-Tribal Dragon
1179-Origami Dragon
1180-Tiny Dragon
1182-Thor Dragon
1183-Loki Dragon
1184-Odin Dragon
1185-Fallen Angel Dragon
1186-Cold Star Dragon
1187-Photon Dragon
1188-Elfic Dragon
1189-Zen Dragon
1190-Tesla Dragon
1191-Kratus Dragon
1192-Saturn Dragon
1193-Dark Stone Dragon
1194-White Knight Dragon
1195-Black Knight Dragon
1196-Thief Dragon
1197-Deus Pet Dragon
1198-Midas Dragon
1199-Kryptonite Dragon
1200-Aquamarine Dragon
1201-Blue Fire Dragon
1202-Hypno Dragon
1203-Stressed Dragon
1204-Troglodyte Dragon
1205-Mould Dragon
1206-Vegan Dragon
1207-Rockfeller Dragon
1208-King Solomon Dragon
1209-Scrooge Dragon
1210-Robin Hood Dragon
1211-Wrestler Dragon
1212-Clover Dragon
1213-Fortune Cookie Dragon
1214-Poker Dragon
1215-Juggler Dragon
1216-Ace Dragon
1217-Speed Dragon
1218-Strong Dragon
1219-Endurane Dragon
1220-Wisdom Dragon
1221-Master Dragon
1222-Big Claws Dragon
1223-Chimera Dragon
1224-Eclipse Dragon
1225-Specter Dragon
1226-Cat Dragon
1227-Crossfire Dragon
1228-Green Fluid Dragon
1229-Frozen Wind Dragon
1230-Canadian Guard Dragon
1231-Aztec Warrior Dragon
1232-Aztec Priest Dragon
1233-Aztec Emperor Dragon
1234-Kaleidoscope Dragon
1235-X-Gen Dragon
1236-Flea Dragon
1237-Frightened Dragon
1238-Ocean Dragon
1239-Kiss Dragon
1240-Kelbin Dragon
1241-Storyteller Dragon
1242-Emo Dragon
1243-Horizon Dragon
1244-Magnetic Dragon
1245-Frostfire Dragon
1246-Pure White Dragon
1247-Pure Black Dragon
1248-Vegan Dragon
1249-Hippie Dragon
1250-Bejeweled Dragon
1251-Refracted Dragon
1252-Atila Dragon
1253-Twitter Dragon
1254-Facebook Dragon
1255-Pachamama Dragon
1256-Orphan Dragon
1257-Alchemist Dragon
1258-Jackpot Dragon
1259-Target Dragon
1260-Chobby Dragon
1261-Albino Dragon
1262-Jamaican Dragon
1263-Chocolate Dragon
1264-Blind Dragon
1265-Elements Dragon
1266-Manglar Dragon
1267-Giant Wings Dragon
1268-Amethyst Dragon
1269-Peace Dragon
1270-Desert Dragon
1271-Hearth Dragon
1272-Hairy Dragon
1273-Twister Dragon
1274-Sylvan Dragon
1275-Tatoo Dragon
1276-Sylvan Dragon
1277-Secret Earth Dragon
1278-Secret Flame Dragon
1279-Secret Sea Dragon
1280-Secret Plant Dragon
1281-Secret Ice Dragon
1282-Cosmo Dragon
1283-Columbus Dragon
1284-Bavarian Dragon
1285-Rock Star Dragon
1286-Frankie Dragon
1287-Halloween Dragon
1288-Animation Dragon
1289-Joseon Dragon
1290-Emperor Dragon
1291-Oni Dragon
1292-Hearts Queen Dragon
1293-Big Hat Dragon
1294-Quartz Dragon
1295-Dark Elf Dragon
1296-Sunset Dragon
1297-Snowman Dragon
1298-Xmas Elf Dragon
1299-Necromancer Dragon
1300-Middle Earth Dragon
1301-Shogun Dragon
1302-Marital Arts Dragon
1304-Hawaiian Dragon
1305-Surf Dragon
1306-Ukulele Dragon
1307-Steam Dragon
1308-Howl Dragon
1309-Magnet Dragon
1310-Quake Dragon
1311-Apocalypse Dragon
1312-Millenium Dragon
1313-Forge Dragon
1314-Promethium Dragon
1315-Abyss Dragon
1316-Mirage Dragon
1317-Supersonic Dragon
1318-Core Dragon
1319-Basilisk Dragon
1320-Dolphin Dragon
1321-Easter Dragon
1322-Book Day Dragon
1323-Lightbeam Dragon
1324-Double Terra Dragon
1325-Earth Day Dragon
1326-Double Nature Dragon
1327-Double Flame Dragon
1328-Double Electric Dragon
1329-Double Ice Dragon
1330-Double Metal Dragon
1331-Double Sea Dragon
1332-Mother’s Day Dragon
1333-Felidae Dragon
1334-Space Dragon
1336-Kaiju Dragon
1337-Acustic Dragon
1338-Unity Dragon
1339-Anniversary Dragon
1341-Cheshire Cat Dragon
1342-Pterodactyl Dragon
1350-Zodiac Taurus Dragon
1351-Zodiac Aries Dragon
1352-Zodiac Gemini Dragon
1353-Zodiac Cancer Dragon
1354-Zodiac Leo Dragon
1355-Zodiac Virgo Dragon
1356-Zodiac Libra Dragon
1357-Zodiac Scorpio Dragon
1358-Zodiac Sagittarius Dragon
1359-Zodiac Capricorn Dragon
1360-Zodiac Aquarius Dragon
1361-Zodiac Pisces Dragon
1362-O Rei Dragon
1363-Ney Dragon
1364-Pelusa Dragon
1365-Pulga Dragon
1366-Orange Dragon
1367-Inesta Dragon
1368-Ranoldo Dragon
1369-Zizou Dragon
1370-Father’s Day Dragon
1371-Rapunzel Dragon
1372-Little Red Riding Hood Dragon
1373-Adventure Dragon
1374-Cyborg Dragon
1375-Da Vinci Dragon
1376-Korean Soccer Dragon
1377-Independence Day Dragon
1378-Genie Dragon
1379-Shaolin Dragon
1380-Sorcerer (Witcher) Dragon
1381-Hellgate
1382-Albino Dragon
1383-Gold Rush Dragon
1384-Apache Dragon
1385-Sheriff Dragon
1386-Mozart Dragon
1387-Hansel&Gretel
1388-Detective Dragon
1389-Astronaut Dragon
1390-Brave Sword Dragon
1391-Scientific Dragon
1392-Red Egg Dragon
1393-Mystic Tribe Dragon
1394-Nocturnal Dragon
1395-Flying Chest
1396-Dragoonie Dragon
1397-Longhorn Dragon
1398-Sleeping Beauty Dragon
1399-Mystic Plant Dragon
1400-Explosive Dragon
1401-Necro Dragon
1402-Allure Dragon
1403-Sad Dragon
1406-Krait Dragon
1407-Golem Dragon
1408-Ragnor Dragon
1409-Dark Angel Dragon
1410-Deus Advisor
1411-Mystic Blizzard Dragon
1412-Water Storm Dragon
1413-Adamantium Dragon
1414-Citadel Dragon
1415-Mystic War Dragon
1416-Greddy Dragon
1417-Secret Fire Dragon
1418-Secret Earth Dragon
1419-Porcelain Dragon
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