I'd be suprised if you got any real answers to that question.
Did you even try find out how to do it yourself?
Did you look at the tools required to make a new mob/edit your client?
Maybe say what tools your trying to use so we can help you a little more.
This is a community to help people, but we're not here to just give you every answer handed to you without any effort on your part.
Ok.
I use shStudio for create new mob.
I created a new monster under the number 40000.
Then I changed it to number 361 and asked that the Montreux set in the database. (This was already a monster database. He was listed there as ErrorMonster361.
I imported the file Monster.SData to my client and went into the game.
When I wrote in the general chat / mmake 361, I got the error "No permission to create."
Maybe because your character doesn't have admin abilities?
(If you post "How do I get admin/GM abilities?" I hope someone hits you with a 7 inch ***** >..>)
The permission errors don't show up on a normal player...
That error is usually due to mismatching data. Either the mob isn't configured right in the database, or it is in the client. Or hell, both. The game realizes you want to summon a mob, but it can't seem to read the mob's data. Meaning something is wrong.
Just me but I would have used the id number and everything related to that error monster in the data base and match it to the client side then changes made client side changed on the database side.