>>57937491It might not be hard, but it certainly isn't fun when the entire point was to use your team that you had raised, so much so that they built entire sections on the game with that functionality (Oak's Lab, GB Tower, most gift Pokemon being choices and with 2 and the minigames using your Pokemon, Your Room, Mystery Gift and probably some other stuff I am forgetting).
Saying Stadium isn't hard with rentals is the same as saying the Battle Frontier in Emerald isn't hard, that's because when someone says either of these things aren't hard it's because there's a known set of things that work but at that point why even play, you're just retreading old ground/known things and not building a team or figuring out things yourself. Same thing with Ultra Necrozma in Ultra Sun/Moon when people were like "lol it's easy, just hard counter it with Focus Sash + Endeavor or use Zoroark".