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>Brave nature so you don't lower Water Gun's power while focusing on boosting your Skull Bash
pic related
>Also the Speed drop is useful for outslowing your opponent when using Counter
>Skull Bash boosts your Defense and allows you to take hits better for efficient Counter spam
>Water Gun for Pokemon like Onix who resist Normal but have bad Special Defense
>Self-Destruct when you feel like Mewtwo has done its job