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What's a core gameplay mechanic you'd personally like to see overhauled? Abilities, berries, EVs, etc.
I'd personally love berries and healing items being combined somehow, I find that berries fall off hard for me almost immediately in most mainline games, only returning to relevancy for things like Lum Berries/Herbs in online play. Even as early as gen 3 they developed a whole extra system to justify berries (Pokeblocks, then Poffins).