It's nothing more but grunt work that can be done by literally anyone. You hire additional 3D model artists and animators to do the job. It's in no way "impossible" except if you don't want to put in the effort.
Also, remember this quote from a certain fellow?
"A delayed game is eventually good, but a rushed game is forever bad."
Seriously. Pokemon is the largest franchise in the world, but Game Freak still has a smaller staff than those that work on Final Fantasy, Persona, DQ or any other RPG that sells magnitudes lower than even the worst Pokemon game. They have the money to hire a bunch of people to beef up their capabilities, but instead they split their already thin numbers across multiple titles, putting priority on Town and Giga Wrecker of all bloody things rather than focusing on making SwSh the best game it can be. It's just beyond comprehension