Description, catalog fields, rules text, and how it plays—in one place.
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This card stays in play when you play it. Discard this card if another Stadium card comes into play. Once during each player's turn (before attacking), that player may flip a coin. If heads, that player chooses 1 of his or her Evolved Pokémon in play and discards the top Evolution card from that Pokémon, devolving it.
Abilities, attacks, weakness & resistance
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Undersea Ruins (ecard2-138) is a Stadium Trainer card. Once during each player's turn, that player may flip a coin and if heads choose one of their Evolved Pokémon and discard its top Evolution card to devolve it. The card remains in play after being played and is discarded only if another Stadium replaces it.
Catalog pricing data as of 14 Apr 2026, 16:57