Wow. What the fuck, Game Freak. They never fail to impress, do they?
I'd understand it if they were doing what any half-decent developer would do when bringing their series to an HD console, which is to remake all your assets. But no. All Pokémon models in this game, except for the new generation ones, are being reused from older games - most of them dating all the way back to 2013's X & Y. And X & Y had them all available, of course. A 3DS game, in 2013.