Renown for their defenses in battle, Metal Pokemon are some of the toughest Pokemon to knock out in Gym Leader Challenge format. With various Abilities, Tool Cards and Special Energy to boost their already formidable Hit Points, behemoths like Aggron from Chilling Reign and Copperajah from Sword and Shield can sweep an unprepared board state. While most Metal Pokemon take time to set up, Kartana from Celestial Storm is an ideal opener, dishing out an intimidating 130 damage for just two Energy. With multiple options to accelerate Energy into play, Metal appears to have all the makings of a top tier deck in Gym Leader Challenge format. Check it out!