Rayquaza GX was a Pokémon Trading Card Gamedeck archetype played during the very end of the 2017-2018 season, remaining as a contender through the whole 2018-2019 season. The deck's strategy revolved around Rayquaza-GX's potential to deal damage for each energy in the player's Pokémon and its Ability to attach energies to itself when put into play. Rayquaza GX's best results were 1st place in the Masters Division at the 2018 Japan Championships and 4th, 5th and 7th places in the Masters Division at the 2018 Pokémon Trading Card Game World Championships. Semifinalist Pedro Eugenio Torres' version was printed as a promotional World Championships deck, Dragones y Sombras.
Rayquaza GX offered a very solid strategy through its main attacker: Rayquaza-GX's Stormy Winds Ability allowed the player to attach a basic energy from the discard pile when put into play with the drawback of discarding cards from the deck and its Dragon BreakAttack dealt 30 damage times the number of each and energies in the player's Pokémon. Supporting Pokémon would be played along as secondary attackers, speed up energy attachments or to allow the player to draw all possible Rayquaza-GX from their deck. Max Elixir was a great way to power up benched Pokémon and allowed a big swing with the right setup on the player's first turn. Tapu Koko ♢ and Shaymin ♢ were also late but notable additions to the archetype.
Rayquaza-GX - When played in the field, Rayquaza-GX's Stormy Winds Ability could discard the top 3 cards from the player's deck and attach a basic energy to itself, even if not one of those discarded cards. Its Dragon Break attack could knock out most Basic Pokémon-EX and Pokémon-GX with 6 basic and energies in the player's Pokémon.
Marshadow -Its Let Loose Ability was a cheap way to redraw cards with a non-GX Pokémon.
Tapu Koko ♢ - Its Dance of the Ancients Ability allowed the player to attach more energies to benched Pokémon.
Shaymin ♢ - A secondary attacker with free retreat cost and a similar attack to Rayquaza-GX.
Max Elixir - Played for a chance to attach basic energies from the deck to benched Rayquaza-GX.