Josie used Growlithe in its debut in The Rescue Operation!, where he and Josie's Kland rescued Jon and herself included from a cage after they were abducted by Lusamine, it battled against the Aether Foundation employee's Golbat and won without breaking a sweat, but when Faba showed up with his Hypno and more Aether Foundation employees, he tried battling them and Faba but lost. In The Battle For The Chosen 128, he was revealed to have evolved into Arcanine sometime before the Alola League where it battled Lilly's Pyukumuku and won with a little bit of difficulty.
She used Arcanine again where it was shown to have learned Attract much to everyone's surprise, and Jon didn't know that Arcanine can use Attract, and confirmed that her Arcanine was a male after using it on a Trainer's Raichu who was a female.
She used it again in a full battle with ???, where it battled a Blissey, and thanks to Josie's sheer determination allowed Arcanine to learn Flare Blitz.
In his debut as a Growlithe, e was shown to be very loyal to its Trainer, he does have an aggressive side when he sees villainous teams such as Faba. He is also shown to have a keen sense of smell and is really good at knowing directions which was shown in The Rescue Operation!, Josie relies on Growlithe for its nose since his scent of smell is like a radar.
After evolving into Arcanine, he still shows loyalty to Josie, he is also shown to be a strong battler and very fast at dodging attacks, he is also shown to be very intelligent and has very strong instincts what its commands are. He also loves its fur being groomed as of The Battle For The Chosen 128 where he was cleaned by Josie and her Minccino.