>>53751305Them shrinking isn't the issue. The issue is that they never use this supposed ability of theirs in situations where it would be useful.
Like, there's no reason to return to normal size after escaping from a Poke Ball when they can just stay shrunken and run away. Cages and nets shouldn't be able to contain them. They should also making use of this ability to dodge attacks (Minimize).
It raises too many questions and breaks the worldbuilding.