[Dppt] Looking to edit an NPC trainer

[NatesWife4Ever]

Hello there! I have a Diamond ROM hack I'm making and like 20% is done. I still need to finish some trainers since I'm adding a 2nd rival. Problem is that I wanna make Rival 2 (Let's call her Onyx) move. I already planned out where all Onyx's battles are, but I need her to sorta walk off screen and making the player not move until she finished. How do I do that? (I mostly use SDSME and a couple of others if that's useful..) Oh! And I also need to edit some sprites that apply only for her or something like that "-_-

Help?

Edited December 2, 2022 by NatesWife4Ever
forgot to mention the sprite thingy heh