AttackEnergy Control
Flip a coin. If heads, choose a basic Energy card attached to 1 of your opponent's Pokémon and attach it to another of your opponent's Pokémon of your choice.

Mewtwo is Pokédex #150, generation 1 (Kanto). Mewtwo is a Basic Psychic Pokémon with 60 HP. The card lists level 13.
Mewtwo sits at 12/53 in Wizards Black Star Promos, position 12 of 53. Before it is 11 Eevee, and after it is 13 Venusaur. The set belongs to the Base series. It was released on 1 July 1999. The printed size is 53, and the checklist is the same length. The listed rarity is Promo.
The attack Energy Control lists no damage number. The cost is Psychic. Flip a coin. If heads, choose a basic Energy card attached to 1 of your opponent's Pokémon and attach it to another of your opponent's Pokémon of your choice. Telekinesis is another attack lists no damage number. The cost is Psychic, Psychic, Psychic. Choose 1 of your opponent's Pokémon. This attack does 30 damage to that Pokémon. Don't apply Weakness and Resistance for this attack. (Any other effects that would happen after applying Weakness and Resistance still happen.) Weakness is Psychic ×2. Retreat cost is 2. The flavor text reads "A scientist created this Pokémon after years of horrific gene-splicing and DNA engineering experiments."
Mewtwo (#150) has 88 other cards in the catalog. Those other cards are in 42 sets. The other printings with a release date run from 1999 to 2026. The earliest other card is Mewtwo 10/102 in Base (1999). Both list 60 HP. The rarity there is Rare Holo, and here it is Promo. Ken Sugimori illustrated that card, and Christopher Rush illustrated this one. Retreat cost there is 3, and here it is 2. 85 other cards of Mewtwo list a different HP.
The illustrator line reads Christopher Rush. I count 1 other cards in the catalog with that illustrator.
Wizards Black Star Promos set binder is where a full Wizards Black Star Promos 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.
Flip a coin. If heads, choose a basic Energy card attached to 1 of your opponent's Pokémon and attach it to another of your opponent's Pokémon of your choice.
Choose 1 of your opponent's Pokémon. This attack does 30 damage to that Pokémon. Don't apply Weakness and Resistance for this attack. (Any other effects that would happen after applying Weakness and Resistance still happen.)
A scientist created this Pokémon after years of horrific gene-splicing and DNA engineering experiments.
Wizards Black Star Promos, in the Base series. It was released on 1 July 1999. The printed size is 53.
12/53. It is entry 12 of 53 in this checklist.
Christopher Rush. The catalog lists 1 other cards with that illustrator.
Promo.
Mewtwo #150, generation 1 (Kanto).
Energy Control and Telekinesis.