AttackEnergy Absorption
Attach up to 2 Energy cards from your discard pile to Mewtwo ex.

Mewtwo is Pokédex #150, generation 1 (Kanto). Mewtwo ex is a Basic ex Psychic Pokémon with 100 HP.
Mewtwo ex sits at 101/109 in Ruby & Sapphire, position 101 of 109. Before it is 100 Magmar ex, and after it is 102 Scyther ex. The set belongs to the EX series. It was released on July 1, 2003. The printed size is 109, and the checklist is the same length. The listed rarity is Rare Holo EX.
The attack Energy Absorption lists no damage number. The cost is Psychic. Attach up to 2 Energy cards from your discard pile to Mewtwo ex. Psyburn is another attack lists 60 damage. The cost is Psychic, Psychic, Colorless. Weakness is Psychic ×2. Retreat cost is 3. The card text says: When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
Mewtwo (#150) has 88 other cards in the catalog. Those other cards are in 41 sets. The other printings with a release date run from 1999 to 2026. The earliest other card is Mewtwo 10/102 in Base (1999). That card is named Mewtwo, while this one is Mewtwo ex. That card lists 60 HP, and this one lists 100 HP. The rarity there is Rare Holo, and here it is Rare Holo EX. Ken Sugimori illustrated that card, and Katsura Tabata illustrated this one. 86 other cards of Mewtwo list a different HP.
The illustrator line reads Katsura Tabata. I count 35 other cards in the catalog with that illustrator.
Ruby & Sapphire set binder is where a full Ruby & Sapphire set goes. This card fills one slot there. A generation binder holds one card of each species. Mewtwo can fill a slot in Generation 1 binder (Kanto). I still need this card.
Attach up to 2 Energy cards from your discard pile to Mewtwo ex.
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
Ruby & Sapphire, in the EX series. It was released on July 1, 2003. The printed size is 109.
101/109. It is entry 101 of 109 in this checklist.
Katsura Tabata. The catalog lists 35 other cards with that illustrator.
Rare Holo EX.
Mewtwo #150, generation 1 (Kanto).
Energy Absorption and Psyburn (60).