Notice: You need the wildhunter summoner skill!
While I was messing arround with packets I found out that you can use any ID for monster, here are a few packets to summon in free market entrance:
67 00 25 02 7D 01 A6 C7 C9 01 01 02 47 86 00 48 01 21 00 00 = spawn zakum
67 00 25 02 7D 01 A6 C7 C9 01 01 30 BC 86 00 48 01 21 00 00 = spawn crog
67 00 25 02 7D 01 A6 C7 C9 01 01 21 95 86 00 48 01 21 00 00 = spawn Pink bean + bonus!
67 00 25 02 7D 01 A6 C7 C9 01 01 27 95 86 00 48 01 21 00 00 = pink bean mini boss
67 00 25 02 7D 01 A6 C7 C9 01 01 30 DA 81 00 48 01 21 00 00 = pianus
67 00 25 02 7D 01 A6 C7 C9 01 01 22 6E 86 00 48 01 21 00 00 = horntail buffs
67 00 25 02 7D 01 A6 C7 C9 01 01 63 6D 7D 00 48 01 21 00 00 = Leviathan
67 00 25 02 7D 01 A6 C7 C9 01 01 F0 5B 7C 00 48 01 21 00 00 = Balrog
67 00 25 02 7D 01 A6 C7 C9 01 01 21 D1 7C 00 48 01 21 00 00 = Griffey
67 00 25 02 7D 01 A6 C7 C9 01 01 20 D1 7C 00 48 01 21 00 00 = Manon
67 00 25 02 7D 01 A6 C7 C9 01 01 22 B3 81 00 48 01 21 00 00 = PAP 2nd form
67 00 25 02 7D 01 A6 C7 C9 01 01 14 3D 7C 00 48 01 20 00 00 = rissel squid
67 00 25 02 7D 01 A6 C7 C9 01 01 00 83 7C 00 48 01 21 00 00 = Gate keeper
67 00 25 02 7D 01 A6 C7 C9 01 01 34 F8 7C 00 48 01 21 00 00 = Skelegon
67 00 25 02 5A 01 A6 C7 C9 01 01 44 1F 7D 00 48 01 21 00 00 = Memory guardian
67 00 25 02 7D 01 A6 C7 C9 01 01 66 6D 7D 00 48 01 21 00 00 = Lyka
67 00 25 02 7D 01 A6 C7 C9 01 01 42 7C 92 00 48 01 21 00 00 = new year pouch 1
67 00 25 02 7D 01 A6 C7 C9 01 01 69 6D 7D 00 48 01 21 00 00 = snack bar
67 00 25 02 7D 01 A6 C7 C9 01 01 60 6D 7D 00 48 01 21 00 00 = eliza
Here is a bypassed Packet Editor.