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>ability that lowers defense
>move that increases defense
What are you trying to do here? Even if you get super fast with your defense intact, you still won't hit hard. Just go full Focus Sash, Weak Armor, Shell Smash, Fire Blast, Earth Power, Ancient Power / Hidden Power Grass. If you want a sweeper that is, but Magcargo doesnät really have the typing to serve as a wall unless you need to counter something specific.