Once during your turn (before your attack), you may treat all Lightning Energy attached to your Active Pokémon as Water Energy for the rest of the turn. (Benching or evolving it ends this effect.) You can't use this power if Lanturn is affected by a Special Condition.
Count the number of Lightning Energy cards attached to Lanturn. This attack does 20 damage plus 10 more damage for each of those Energy cards. Flip a coin. If tails, Lanturn does 10 damage to itself for each of those Energy cards.