From Bulbapedia, the community-driven Pokémon encyclopedia.
Meganium has been featured on 10 different cards since it debuted in the Neo Genesis expansion of the Pokémon Trading Card Game. Meganium cards are normally Grass-type Stage 2 Pokémon. In Japan, Meganium was featured in the Meganium Constructed Starter Deck released in April 2005. Outside of Japan, Meganium was also featured in the Meganium ex Deck released in May 2007.
List of Pokémon cards featuring Meganium