PlusPower reads: "Attach PlusPower to 1 of your Pokemon. Discard this card at the end of your turn. If the Pokemon PlusPower is attached to attacks, the attack does 10 more damage to the Active Pokemon (before applying Weakness and Resistance)." Strenght Charm reads: "Whenever an attack from the Pokémon that Strength Charm is attached to does damage to the Active Pokémon, the attack does 10 more damage (before applying Weakness and Resistance). Discard Strength Charm at the end of the turn in which this Pokémon attacks." What is the advantage of using strenght charm in your deck rather than PowerPlus?