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As long as Energy Root is attached to a Pokémon, that Pokémon gets +20 HP and can't use any Poké-Powers or Poké-Bodies.
Card rule
Attach Energy Root to 1 of your Pokémon (excluding Pokémon-ex and Pokémon that has Dark or an owner in its name) that doesn't already have a Pokémon Tool attached to it. If the Pokémon Energy Root is attached to is Pokémon-ex or has Dark or an owner in its name, discard Energy Root.
