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It's supposed to be a plausible world, not a 1:1 recreation of the games.
Stats in the games exist because an RPG can't properly portray a real fight, so it uses numbers to represent what's going on instead.
The anime doesn't have this limitation so it has a lot more freedom to get creative with what happens.
This isn't Yu-Gi-Oh where they're meant to be playing a game with a rigid set of rules, it's two sentient creatures fighting each other, so shit like Pikachu destroying the sprinklers to weaken Onix or using Iron Tail to kick up dirt and block an attack makes more sense than them sititng there taking turns using game moves on each other until HP is depleted to 0.
