Lanturn are large, blue fish-like Pokémon with a pair of small blue fins. They have a yellow "mask" over their eyes, which have red irises. The tip of the bottom of their oddly shaped tail is also yellow. Lanturn's yellow orbs come from a modification of its dorsal fin. These orbs contain a colony of bacteria that creates a chemical reaction that generates electricity in a similar fashion to that of a battery, and Lanturn can freely manipulate such electricity.
Lanturn uses the bright part of its body, which changed from a dorsal fin, to lure fish prey. It then blinds the prey with an intense burst of light, and swallows the immobilized prey in a single gulp.
Lanturn inhabits the ocean at depths of over three miles (five kilometers).
Lanturn are carnivorous hunters.
This Pokémon was unavailable prior to Generation I.