>>19123725For one, the overworld is in a different style as battles. The overworld is way more chibi, the proportions are more exaggerated so that faces can be recognizable even on smaller models.
Second of all, downscaling a large model just won't look good. If they just take a model of a large, detailed Pokémon like Xerneas or Tyranitar and scale it down to fit in one grid spot, it's going to look like a fucking mess. If you've ever tried 3D modeling, you'd realize that it's not as simple as just "removing a few polygons", even if they don't want to redo them to fit the overworld style.
It'd be neat if they add it, but I can't see it happening.
