IN THE MANGA
Lance appears as the main antagonist of the Yellow arc. Much like the protagonist, Yellow, as well as Giovanni he too was born in the Virdian Forest, where people who born there are granted special powers, where his special powers, is the ability of teleplay, allowing him to telepathically communicate with his Pokemon and the power of healing which he can use to heal them. Lance's telepathy also allows him to control primarily Dragon-type Pokemon and as well as any Pokemon that is close to a Dragon-type such as Aerodactyl
Originally debuting at the end of the Red, Blue, and Green chapter, in a cameo with his fellow Elite Four members, he first made his first official appearance in the Vermillion City Surfing Contest
He later become a good guy helping out with other crisis'.
IN THE GAMES
He is one of the Elite Four in Generations I and III, and the Champion in Generations II and IV. Unlike his manga counterpart, he is an ally of the player and a hero instead of a villain.
- Lance in Heroes Wiki.