AttackPull Down
If your opponent has any Evolved Pokémon in play, remove the highest Stage Evolution card from each of them and put those cards back into his or her hand.

Omastar is Pokédex #139, generation 1 (Kanto). Omastar is a Stage 2 Water Pokémon with 110 HP. The card says it evolves from Omanyte. In this catalog that name is Omanyte (#138).
Omastar sits at 20/108 in Power Keepers, position 20 of 108. Before it is 19 Ninetales, and after it is 21 Pichu. The set belongs to the EX series. It was released on February 2, 2007. The printed size is 108, and the checklist is the same length. The listed rarity is Rare.
The attack Pull Down lists no damage number. The cost is Colorless. If your opponent has any Evolved Pokémon in play, remove the highest Stage Evolution card from each of them and put those cards back into his or her hand. Hydrocannon is another attack lists 30+ damage. The cost is Colorless, Colorless. Does 30 damage plus 20 more damage for each Water Energy attached to Omastar but not used to pay for this attack's Energy cost. You can't add more than 40 damage in this way. Weakness is Lightning ×2. Retreat cost is 2.
Omastar (#139) has 16 other cards in the catalog. Those other cards are in 14 sets. The other printings with a release date run from 1999 to 2023. The earliest other card is Omastar 40/62 in Fossil (1999). That card lists 70 HP, and this one lists 110 HP. The rarity there is Uncommon, and here it is Rare. Retreat cost there is 1, and here it is 2. 13 other cards of Omastar list a different HP.
The illustrator line reads Ken Sugimori. I count 1,112 other cards in the catalog with that illustrator.
Power Keepers set binder is where a full Power Keepers set goes. This card fills one slot there. A generation binder holds one card of each species. Omastar can fill a slot in Generation 1 binder (Kanto). I still need this card.
If your opponent has any Evolved Pokémon in play, remove the highest Stage Evolution card from each of them and put those cards back into his or her hand.
Does 30 damage plus 20 more damage for each Water Energy attached to Omastar but not used to pay for this attack's Energy cost. You can't add more than 40 damage in this way.
Power Keepers, in the EX series. It was released on February 2, 2007. The printed size is 108.
20/108. It is entry 20 of 108 in this checklist.
Ken Sugimori. The catalog lists 1,112 other cards with that illustrator.
Rare.
Omastar #139, generation 1 (Kanto).
Pull Down and Hydrocannon (30+).