Rules
Holon Energy FF provides Colorless Energy.
If the Pokémon that Holon Energy FF is attached to also has a basic Fire Energy card attached to it, that Pokémon has no Weakness. If the Pokémon that Holon Energy FF is attached to also has a basic Fighting Energy card attached to it, damage done by that Pokémon's attack isn't affected by Resistance. Ignore these effects if Holon Energy FF is attached to Pokémon-ex.
