From Bulbapedia, the community-driven Pokémon encyclopedia.
Treecko has been featured on 17 different cards since it debuted in the EX Ruby & Sapphire expansion of the Pokémon Trading Card Game. Treecko cards are normally Grass-type Basic Pokémon. In Japan, Treecko was featured in the Treecko Half Deck released in January 2003.
List of Pokémon cards featuring Treecko