When Pokémon TCG Pocket first launched, the meta quickly became dominated by a select few decks. Among them, Misty's water-type Pokémon deck gained notoriety for its potential to overpower opponents early on, largely depending on favorable coin flips. This deck, centered around the Misty Supporter card, allows players to flip coins until they land on tails, attaching a water-type energy to a chosen water-type Pokémon for each heads flipped. This mechanic can lead to dramatic swings in power, enabling players to attach anywhere from zero to numerous energies, potentially allowing for a first-turn win or bringing powerful cards into play before the opponent can counter.

Despite the release of three expansions since the game's launch, the dominance of Misty decks has not waned. Instead, the latest expansion, Triumphant Light, has introduced a new card, Irida, which further bolsters these decks. Irida, another Supporter card, can heal 40 damage from each Pokémon with water-type energy attached, enhancing the resilience of water decks. This addition, combined with previous cards like Vaporeon from Mythical Island and Manaphy from Space-Time Smackdown, has kept water decks at the forefront of the meta, frustrating many players who crave more variety in the game.

Some Pokémon TCG experts suggest that the introduction of Irida might be an attempt by developer DeNA to force players to make strategic choices about which Supporter cards to include in their limited 20-card decks. However, savvy players have found ways to incorporate both Misty and Irida, maintaining the deck's strength and versatility.

With a major event on the horizon, where players can earn rewards like a gold profile badge for winning five matches in a row, the prevalence of water decks is expected to be even more pronounced. The challenge of achieving such a win streak is daunting, especially against decks that can leverage coin flips and healing to maintain an edge. As a result, many players are considering joining the water deck bandwagon to compete effectively in this competitive environment.