AttackCrystal Barrier
Flip a coin. If heads, prevent all effects of an attack, including damage, done to Tentacool during your opponent's next turn.

Tentacool is Pokédex #072, generation 1 (Kanto). Tentacool is a Basic Water Pokémon with 50 HP. The card lists level 16. The card lists Tentacruel, Tentacruel (#073) under evolves to.
Tentacool sits at 125/146 in Legends Awakened, position 125 of 146. Before it is 124 Taillow, and after it is 126 Tyrogue. The set belongs to the Diamond & Pearl series. It was released on August 1, 2008. The printed size is 146, and the checklist is the same length. The listed rarity is Common.
The attack Crystal Barrier lists no damage number. The cost is Colorless. Flip a coin. If heads, prevent all effects of an attack, including damage, done to Tentacool during your opponent's next turn. Mysterious Beam is another attack lists no damage number. The cost is Water. Flip a coin. If heads, discard an Energy card attached to the Defending Pokémon. Weakness is Lightning +10. Retreat cost is 1. The flavor text reads "Its body is virtually composed of water. It shoots strange beams from its crystal-like eyes."
Tentacool (#072) has 15 other cards in the catalog. Those other cards are in 13 sets. The other printings with a release date run from 1999 to 2023. The earliest other card is Tentacool 56/62 in Fossil (1999). That card lists 30 HP, and this one lists 50 HP. Both list the rarity Common. Kagemaru Himeno illustrated that card, and Atsuko Nishida illustrated this one. 10 other cards of Tentacool list a different HP.
The illustrator line reads Atsuko Nishida. I count 408 other cards in the catalog with that illustrator.
Legends Awakened set binder is where a full Legends Awakened set goes. This card fills one slot there. A generation binder holds one card of each species. Tentacool can fill a slot in Generation 1 binder (Kanto). I still need this card.
Flip a coin. If heads, prevent all effects of an attack, including damage, done to Tentacool during your opponent's next turn.
Flip a coin. If heads, discard an Energy card attached to the Defending Pokémon.
Its body is virtually composed of water. It shoots strange beams from its crystal-like eyes.
Legends Awakened, in the Diamond & Pearl series. It was released on August 1, 2008. The printed size is 146.
125/146. It is entry 125 of 146 in this checklist.
Atsuko Nishida. The catalog lists 408 other cards with that illustrator.
Common.
Tentacool #072, generation 1 (Kanto).
Crystal Barrier and Mysterious Beam.