>>50463957They all interact weirdly with Dynamax.
Pursuit has funky priority. If you use Pursuit on a Dynamaxed mon that's trying to switch out, it's not clear whether it would use the doubled HP or normal HP when calculating damage. Gamefreak just cut it because it was easier than figuring that out.
Return has variable power. If you Dynamax a mon with Return and use Max Strike, how much power would it have? It's not clear if its power would vary based on friendship or how much. Gamefreak just cut it because it was easier than figuring that out.
Hidden Power can be any type. If you Dynamax a mon with Hidden Power, what move does it become? Should it be normal-type, or the type it was before maxing? What about the secondary effect? Gamefreak just cut it because it was easier than figuring that out.