Wow yeah just as I expected it1. Steven
8. XYZ Ash
9. SM Ash
Ash greninja is comparable to Alain's Mega Charizard x who fought Steven well. (May need to rewatch the special) the rest of his team can wear down Stevens Metagross.
Alola ash with peakachu 10 mil volt could deal tons of damage and the rest of his mons can help out after that.