Growlie is actually the nickname of James' Growlithe. It debuted in Holy Matrimony. It later reappeared in The Treasure Is All Mine! which showed more of James' past and why his parents wanted him to marry Jessiebelle. It is still with James's parents, remaining loyal to them. It helped James to run away.
|Dig||The Treasure Is All Mine!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.