AttackClamp Crush
Flip a coin. If heads, your opponent's Active Pokémon is now Paralyzed and discard an Energy attached to that Pokémon.

XY is a set in the XY series. It was released on February 5, 2014. The printed size is 146, and the checklist is the same length. Cloyster is 32/146, in position 32 of 146 on this checklist. Before it is 31 Shellder, and after it is 33 Staryu. The listed rarity is Rare.
Cloyster is a Stage 1 Water Pokémon with 100 HP. In the Pokédex this is Cloyster (#091), generation 1 (Kanto). The card says it evolves from Shellder. In this catalog that name is Shellder (#090).
Masakazu Fukuda illustrated this card. The same name is on 471 other cards in the catalog.
Cloyster (#091) has 13 other cards in the catalog. Those other cards are in 12 sets. The other printings with a release date run from 1999 to 2023. The earliest other card is Cloyster 32/62 in Fossil (1999). That card lists 50 HP, and this one lists 100 HP. The rarity there is Uncommon, and here it is Rare. Kagemaru Himeno illustrated that card, and Masakazu Fukuda illustrated this one. Retreat cost there is 2, and here it is 3. 11 other cards of Cloyster list a different HP.
The attack Clamp Crush lists 30 damage. The cost is Water, Colorless. Flip a coin. If heads, your opponent's Active Pokémon is now Paralyzed and discard an Energy attached to that Pokémon. Spike Cannon is another attack lists 30× damage. The cost is Water, Water, Colorless. Flip 5 coins. This attack does 30 damage times the number of heads. Weakness is Grass ×2. Retreat cost is 3. The flavor text reads "Cloyster that live in seas with harsh tidal currents grow large, sharp spikes on their shells."
I keep a set binder for XY, meant to hold every card of that set. This card is one slot in the XY set binder. A generation binder holds one card of each species. Cloyster can fill a slot in Generation 1 binder (Kanto). I still need this card.
Flip a coin. If heads, your opponent's Active Pokémon is now Paralyzed and discard an Energy attached to that Pokémon.
Flip 5 coins. This attack does 30 damage times the number of heads.
Cloyster that live in seas with harsh tidal currents grow large, sharp spikes on their shells.
XY, in the XY series. It was released on February 5, 2014. The printed size is 146.
32/146. It is entry 32 of 146 in this checklist.
Masakazu Fukuda. The catalog lists 471 other cards with that illustrator.
Rare.
Cloyster #091, generation 1 (Kanto).
Clamp Crush (30) and Spike Cannon (30×).