>>58209763
>It's a another thread where idiots try to insist that "shrink" is meant the most literal possible way. That Pokémon literally just have their bodies physically uniformly shrunk down in the literal sense and just are there inside literally with nothing else going on. Oh, and don't forget, the Pokémon is the source of the shrinking and not the ball!
The most likely thing for both the main games and main anime. Is that the Pokémon's body is deconstructed to be stored as that glowing energy-looking mass, with the Pokémon's consciousness experiencing some kind of simulated space.

For example. This very recent example in the anime of a Quaxly in a Luxury Ball.