From Bulbapedia, the community-driven Pokémon encyclopedia.
Latios has been featured on 20 different cards since it debuted in the EX Dragon expansion of the Pokémon Trading Card Game. Latios cards are normally Dragon-type or Psychic-type Basic Pokémon. In Japan, Latios was featured in the Latios Half Deck of the Gift Box released in November 2003. Outside of Japan, Latios was featured in the Latios Half Deck of the EX Trainer Kit released in June 2004.
List of Pokémon cards featuring Latios