This Larvitar is a rock/ground-type Pokémon owned by Chris.
Larvitar, seeing Chris playing with Cubchoo, observed as he was opening and closing the door. One night, it managed to open the door and free Cubchoo, then crawl under the wall and go into the forest to play with each other. The heroes have managed to find both of them. Since Chris did not have a battle, Ash sent Scraggy to battle Larvitar. Both were evenly matched and the battle ended in a draw. Since Larvitar befriended Cubchoo, Chris decided to let Larvitar stay with them.