A Stage 2 Pokemon Card of type Water, Darkness with the title Team Aqua's Walrein and 120 HP of rarity Rare Holo evolved from Team Aqua's Sealeo from the set Team Magma vs Team Aqua.  It has the attack Power Blow with the cost Water, the energy cost 1 and the damage of 10+ with the description: Does 10 damage plus 10 more damage for each Energy attached to Team Aqua's Walrein. It has the attack Hydro Reverse with the cost Water, Water, Colorless, Colorless, the energy cost 4 and the damage of 50+ with the description: You may return any number of basic Water Energy cards attached to all of your Pokemon to your hand. If you do, this attack does 50 damage plus 10 more damage for each Energy you returned. It has weakness against Fighting 2 and . Metal 2. 
Team Aqua's Walrein