Quoted By:
Stop trying to make every mainline game compatible with the previous ones. Allow it to rework mechanics and rebalance mons every two or three gens.
Make some effort into making Pokemon an exciting spectator e-sport. Either stop making half-assed 3d games, or at least go back into making a side series like Stadium, with Pokkén-like graphics.
Shake things in the story to keep hardcore players interested, either by occasionally twisting the mechanics or by putting the players in situations with limited options (disallowing items or free switching, for example), so they have to actually use creativity and advanced knowledge of the mechanics to progress instead of spamming the same moves with their overleveled pokemon, like always.