Mega Rayquaza EX was a Pokémon Trading Card Gamedeck archetype played during the 2015-2016 to 2016-2017 season. The deck's strategy revolved around M Rayquaza-EX's Attack that could deal up to 240 damage on the first turn with the right setup to bench as many Pokémon possible. Mega Turbo added energies to M-Rayquaza to ensure it could use its mildly expensive attack. Thanks to its fast set up and to its high damage cap, Mega Rayquaza EX was a popular archetype in tournaments during the 2015-2016 season, although it suffered for the presence of Night March and, later on, Parallel City which was largely played by many decks. Mega Rayquaza EX's best result was by Top 8 player Calvin Connor in the Senior Division at the 2016 Pokémon US Nationals Championships, but it has also featured in many other tournamets, such as ranking 1st place in the Master Division at the 2016 Liverpool Regional and the 2017 Leipzig Regional.
Mega Rayquaza EX was a very aggressive deck that focused on evolving M Rayquaza-EX, benching as many Pokémon possible and attaching 3 energies for M Rayquaza-EX's attack, which dealt 30 damage times for each of the player's benched Pokémon. Evolving M Rayquaza-EX early was possible due to its Δ EvolutionAncient Trait, which did not count as an Ability and so the opponent could not block its effect. Other strong supporting cards got released in the same expansion as M Rayquaza: Shaymin-EX allowed the player to draw up to 6 cards when played on the field, Sky Field increased the possible number of benched Pokémon (and therefore M Rayquaza's damage) and Mega Turbo added basic energies from the discard pile to M Rayquaza, allowing it to use its attack early. Later on, Hoopa-EX also allowed the player to search their deck for Pokémon-EX, reducing the need of Pokémon-searching cards. Such strength was enough to M Rayquaza-EX knock out most Pokémon-EX on the player's first turn.
As a deck that used energies to attack, Mega Rayquaza EX had a few slightly different techs through the seasons, such as Bronzong and Jolteon-EX variants. While the deck's agressive setup left it open to disruptive and stalling strategies, as well Night March decks due to its weakness, Mega Rayquaza EX's main trouble was later on with the release of Parallel City, a Stadium card that could limit the number of Pokémon on the opponent's side; as a strong contender however, the existance of this archetype was enough pressure to make Parallel City a common card in tournaments.
M Rayquaza-EX - For 3 energies, M Rayquaza-EX's Emerald Break Attack dealt up to 240 damage with Sky Field and a full bench. Its Ancient Trait allowed it to evolve on the turn Rayquaza-EX was played, being useful even if going first: evolving reduced the number of cards in the player's hand to better use Shaymin-EX or common Supporter cards and reduced disruption of opposing Trainer cards.
Shaymin-EX - When played on the field, Shaymin-EX allowed the player to draw cards up to having 6 on its hand. Most Mega Rayquaza EX lists played four copies of this card, making it one of the most expensive decks of the format.
Hoopa-EX - Hoopa-EX's Scoundrel Ring Ability allowed the player to search the deck for up to 3 other Pokémon-EX. As a Pokémon, it was immune to Wobbuffet's Ability lock.
Mega Turbo - Attached a basic energy from the discard pile to Mega Evolutions, being essential to attack on the first turn or recover in a turn the attackers got knocked out.
Float Stone - It allowed the player to freely retreat supporting Pokémon with useless attacks.
Sky Field - Increased the number of benched Pokémon each player could have by 3, increasing M Rayquaza-EX's damage potential and the ammount of Shaymin-EX/Hoopa-EX Abilities that player could use.
Winona - Before the release of Hoopa-EX, Winona was the best way to search the deck for the main Pokémon, though it prevented the player from using more relevant Supporter cards that turn.
Hex Maniac - Counter to other decks that used Abilities to setup or prevent damage dealt.