Josie used Growlithe in its debut in The Rescue Operation!, where she and Josie's Klang 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, she tried battling them and Faba but lost. In The Battle For The Chosen 128, she 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 and Flare Blitz in a full battle with Mark, but Attract failed to work due to Purugly being female, confirming Josie's Arcanine's gender to be female, but it drew with Purugly after a Flare Blitz/Giga Impact collision.
In his debut as a Growlithe, she was shown to be very loyal to its Trainer, she does have an aggressive side when she sees villainous teams such as Faba. She 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 her scent of smell is like a radar.
After evolving into Arcanine, she still shows loyalty to Josie, she is also shown to be a strong battler and very fast at dodging attacks, she is also shown to be very intelligent and has very strong instincts what its commands are. She also loves its fur being groomed as of The Battle For The Chosen 128 where she was cleaned by Josie and her Minccino.