this is for
Ashley actually don't have all eight badges and defeated the elite four, so she just snuck in. she got through all the tough pokemon in the cave and made it to the legendary Mewtwo.
she sent out Pikachu first, but he pretends to use Rest, yeah he wimp out. so what better pokemon to show willpower than her Poocheyana. usually he would attack her, but since this is a legendary pokemon he 's facing he decides to listen to her. but after this battle Poocheyana will go back to attacking her.