>>54375889No, this implies all pokémon can shrink, but only a few learned to weaponise that in-battle.
What use has a Garchomp of Minimise? It's an apex predator and doesn't hunt by ambush. So wasting energy learning how to shrink down doesn't help it, unlike Sandaconda, which can learn it, likely to help with its hunting as it can stay undetected until the strike.
Design tenets also cover movelists, because again "does it make sense for this thing to get minimise?".