Ditto is a Rare card from the Fossil set, numbered #18 in the Pokémon Trading Card Game. Known for its unique ability to transform into the opponent's Pokémon, it holds a special place in collectors' hearts despite its current market value of $0.00. As a part of the early generation of Pokémon cards, its availability and condition can affect its desirability among collectors, though it remains less sought after in the current market.