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The graphics of this game aren't that bad. It's just the art direction that's bad, and that's owed to these facts:
1) It's obviously been a rushed game to get Pokemon on the Switch, so it's an easy way to cut corners
2) Kanto's just not a region that pushes hardware to its limit. It's a homogenous, basic looking region, as it should be being the original region.
I wouldn't worry about how the 2019 games look.