Primal Groudon is the name of the deck used by Alejandro Ng-Guzman, who was the runner-up of the Junior Division in the 2015 World Championships. It is one of the four 2015 World Championships Decks, released in November 2015, and is based around using stalling tactics to prepare Primal Groudon. Each Deck comes with a Worlds 2015 themed Deckbox, a booklet about the championships, a non-tournament-legal print of the sixty card deck, and the 2015 World Championships Pin. The cards included in the deck aren't the prints actually used in the decks, but are the most recent printing of the lowest rarity of the cards.
Alejandro Ng-Guzman brought his Primal Groudon deck—and the plush Primal Groudon that kept watch by his side—all the way to the final round of the Pokémon TCG Junior Division. The deck's star player can be slow to get going, so Robo Substitute can keep the opponent busy until Primal Groudon-EX is ready to go...and when it's ready, it's really ready, with huge HP and an attack that can do massive damage.