As long as Rocket's Entei ex has any Darkness Energy attached to it, Rocket's Entei ex has no Weakness.

• Energy Link

  10

  Search your discard pile for an Energy card and attach it to Rocket's Entei ex.

• Volcanic Ash

  Discard 2 Energy attached to Rocket's Entei ex and then choose 1 of your opponent's Pokemon. This attack does 60 damage to that Pokemon.(Don't apply Weakness and Resistance for Benched Pokemon.)