>>52014964>as in, they didn't decide to pull it out the air as a secret form, it only existed as the anime wrote themselves into a corner and needed an outExactly, the anime couldn't shill anything but newmons with Ash, then thhey went and powergapped Megas to the point only a mega could compete. then they realised they had Ash come up against Mega pokémon with no legitimate method of fighting them on an even footing, so begged Game Freak for a mega, which Game Freak refused (re-write their whole game lore JUST to fit in a cartoon shillmon, kek) and came up with arsepull, a pokemon functionally the same as any bog-standard Greninja, but with a new ability that turned him into a Gen 6-era clone of ash (that's another reason it's gone - it's a now 6-year outdated design of the anime MC) to show it's super speshul.
Doesn't change the fact had the anime allowed M-Sceptile or M-Herracross for Ash's team, Game Freak wouldn't have made "Ass-Greninja".