>>53800863But it's not. The answer, as it was at the start, as it was when it was an entirely different IP with the same core ideas that eventually birthed Pokémon is the creatures shrink to fit the capsule/ball.
And if you'd watched the anime, you'd know stored pokémon get sent to Oak's lab or another pasture/reserve depending on the region and the games expanding on this with Poké Pelago being here your stored pokémon get a chance to explore tropical islands.
It's hilarious, people here squealed "Game Freak need to respect their lore" only to lose their fucking minds when Game Freak whips out pre-localisation lore which utterly obliterated their childhood memories (and proved they haven't a fucking ounce of intelligence, critical thinking or the ability to make educated guesses from existing information about a thing).