>>50635116Pokemon don't shrink. They get converted to light energy by the use of the pokeball and are put into some kind of synthetic stasis or dreamworld-like state but are still semi-aware of their surroundings, and can break out by overloading the ball; like how everyone previously thought.
Them physically shrinking down and being trapped in a tiny plastic sphere reinforces the idea that you are holding them hostage and implies they're your slaves you hold in cages 24/7, and that's no good.