>>28737517I think in this case Special actually has a slight edge, since base Venusaur has island buster level power there. Ash Greninja is definitely strong as fuck, but it doesn't have any quantifiable feat that'd put it solidly at that level, as far as I can recall.
Anyway, going by consistent powerlevels, I'd say Ash = Special > Origins?
Game Red is hard to place skillwise, considering what the games are like.
Origins Red is a 6 year old who relies on his overleveled Charizard and doesn't seem to have that much battle skill.
Special Red has a lot of experience. The fact that he and a lot of other trainers in that verse try to move around and fight with their Pokemon probably gives him a slight advantage depending on the battlefield.
Ash is skilled but suffers from plot induced jobber syndrome. Ash Greninja might give him the edge.