If your opponent's Active Pokémon is a Basic Pokémon, it is Knocked Out.
Records exist of a revived fossil that evolved into Rampardos. It proceeded to escape and then destroy a skyscraper with a headbutt.
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Expansion
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Artist
If your opponent's Active Pokémon is a Basic Pokémon, it is Knocked Out.
If your opponent's Active Pokémon is an Evolution Pokémon, this attack does 60 more damage.