AI image generation wasn't good enough in early 2022 to generate game assets. Yeah you could probably generate pokemon-like looking stuff, but it wouldn't be usable as-is in a game.
Edit: and even today. Generate textures for blocky assets? Sure. But full pokémon models that wouldn't need a ton of rework? Nope.
> But full pokémon models that wouldn't need a ton of rework? Nope.
Well, that is the core benefit of using AI - you can save a lot of the groundwork, especially in concept art. Making 20, 30 versions of "fat rat in yellow with lightning bolt symbols in their fur" is cheap with AI, but prohibitively expensive if you're using humans. You're starting running already.
Edit: and even today. Generate textures for blocky assets? Sure. But full pokémon models that wouldn't need a ton of rework? Nope.