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.