keepitsimple
site of lies
snip
Handicapping Ash against some of the best trainers in the anime likely isn't going to end well for him, regardless of the pokemon he's using (though admittedly I haven't seen anything of Greninja outside of the Kalos League so take that with a grain of salt). I can see Greninja doing well though since he held up pretty well against that Charizard that apparently beat Malva's ace
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Hypothetical Ash-Peakachu vs Alain's Mega Charizard
(yeah I know it's a dumbarse question on my part since Ash-Peakachu doesn't exist but what I'm basically asking is, would you expect him to win if he got a hypothetical power boost similar or equal to the boost Greninja got with his Ash form?)