A Basic Pokemon Card of type Colorless with the title Ditto and 60 HP of rarity Rare Holo from the set FireRed & LeafGreen.  It has the attack Energy Ball with the cost Colorless, the energy cost 1 and the damage of 10+ with the description: Does 10 damage plus 10 more damage for each Energy attached to Ditto but not used to pay for this attack's Energy cost. You can't add more then 20 damage in this way. It has the ability Form Variation with the description: Once during your turn (before your attack), you may search your discard pile for a Basic Pokemon (excluding Pokemon-ex and Ditto) and switch it with Ditto. (Any cards attached to Ditto, damage counters, Special Conditions, and effects on it are now on the new Pokemon.) Place Ditto in the discard pile. It has weakness against Fighting 2. 
Ditto