>>54970465he needs to lose so he can go on another journey. The show basically ended after alola. It's why his best fights are always before the last battle. You go in knowing he's going to lose, so it's never a good fight. Plus it's not like pokemon really show accurate signs of how much fight they have left in them. Literally anything could happen at any moment which is why half the battles are just "1 shot, next pokemon, 1 shot, next pokemon"
