When using Delphox V's "Magical Fire" attack, do I still have to put 2 Energy attached to that Pokemon if my opponent doesn't have any Benched Pokemon?
Yes, you must still put 2 Energy into the Lost Zone when using Magical Fire.
Magical Fire




x2
Eerie GlowYour opponent's Active Pokémon is now Burned and Confused.


Magical FirePut 2 Energy attached to this Pokémon in the Lost Zone. This attack also does 120 damage to 1 of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)
When using Delphox V's "Magical Fire" attack, do I still have to put 2 Energy attached to that Pokemon if my opponent doesn't have any Benched Pokemon?
Yes, you must still put 2 Energy into the Lost Zone when using Magical Fire.