Your search for "walrein 021/080" revealed the following:
Walrein ex - 99/108 - Ultra Rare from Ex Power Keepers, available at 401 Games Canada. Rarity: Ultra Rare Finish: Holofoil Artist: Ryo Ueda Card Text:Chilling Breath - Once during your turn, when you play Walrein ex from your hand...
Walrein - 15/101 - Holo Rare from Ex Hidden Legends, available at 401 Games Canada. Rarity: Holo Rare Finish: Holofoil Artist: Atsuko Nishida Card Text:Poke-POWER Crush DrawOnce during your turn (before you attack), you may reveal the top card of...
Walrein (Japanese) - 029/106 - Uncommon from SV8: Super Electric Breaker, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Card Text:[Water] Frigid Fangs (60)During your opponent's next turn, Pokémon that have 2 or fewer Energy attached can't attack. (This...