Identify where the mob skill is that you want to edit or remove, it is important to know the ID of your moob
Once identified you can search by id within these files
Once identified, by the id of the monster, you will see all the skills it has, it is linked to skill_id if you have no idea what skill it is you can investigate by skills_id or adding one by one to discover it
For example Poring skills :
1002,Poring@NPC_EMOTION,loot,197,1,2000,0,5000,yes,self,always,0,2,,,,,,
1002,Poring@NPC_WATERATTACK,attack,184,1,2000,0,5000,yes,target,always,0,,,,,,,