Easy pet scam sometimes takes awhile to work.
Basically this is a trust trade from another player to you. All you have to do is to get someone to trust you once youve done that you can ask them to borrow their pet so you can train harder. Once you have the pet switch it to another character through the gate master.
And bam you have your brand new 100% pet oh i forgot to mention GMs can do NOTHING about this kind of scam. they cant ban you because the other player had to agree to it and therefore sold you the item for nothing. have fun with it.