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If every Pokémon species could have all of their abilities at the same time (for example, Delcatty with Cute Charm, Normalize and Wonder Skin at the same time), how would that change the metagame?
If they are contradicting abilities (like Steadfast and Inner Focus) just combine them: Pokémon can't be flinched, and when affected by a move that would flinch, it raises the speed