Magcargo

Magcargo (Japanese: マグカルゴ Magcargot) is a /-type Pokémon introduced in Generation II.

Physiology
Magcargo is a large, red Snail Pokémon. It appears to be made of magma. A noticeable thing about Magcargo is that it has a large rock on its back, which turned it into a / Pokémon. Magcargo tend to live in volcanoes.

Evolution
Magcargo is the evolved form of Slugma. Slugma evolves into Magcargo at level 38.

Trivia

 * Magcargo is the only -type Pokémon that has a pre-evolution that isn't a -type.

Origins
Magcargo is a portmanteau of Magma and Escargo.