FireRed & LeafGreen is a set in the EX series. It was released on September 1, 2004. The printed size is 112. This checklist is longer, at 116 cards. Ditto is 4/112, in position 4 of 116 on this checklist. Before it is 3 Dewgong, and after it is 5 Exeggutor. The listed rarity is Rare Holo.
Ditto is a Basic Colorless Pokémon with 60 HP. In the Pokédex this is Ditto (#132), generation 1 (Kanto).
Miki Tanaka illustrated this card. The same name is on 192 other cards in the catalog.
Ditto (#132) has 31 other cards in the catalog. Those other cards are in 19 sets. The other printings with a release date run from 1999 to 2026. The earliest other card is Ditto 3/62 in Fossil (1999). That card lists 50 HP, and this one lists 60 HP. Both list the rarity Rare Holo. Keiji Kinebuchi illustrated that card, and Miki Tanaka illustrated this one. 16 other cards of Ditto list a different HP.
Form Variation is listed as Poké-Power. Once during your turn (before your attack), you may search your discard pile for a Basic Pokémon (excluding Pokémon-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 Pokémon.) Place Ditto in the discard pile. The attack Energy Ball lists 10+ damage. The cost is Colorless. 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. Weakness is Fighting ×2. Retreat cost is 1.
I keep a set binder for FireRed & LeafGreen, meant to hold every card of that set. This card is one slot in the FireRed & LeafGreen set binder. A generation binder holds one card of each species. Ditto can fill a slot in Generation 1 binder (Kanto). I still need this card.
AbilityForm Variation
Poké-Power
Once during your turn (before your attack), you may search your discard pile for a Basic Pokémon (excluding Pokémon-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 Pokémon.) Place Ditto in the discard pile.
AttackEnergy Ball
Damage 10+ · Cost Colorless
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.