Before Pokemon Legends: Arceus, Growlithe and its evolution Arcanine were known for being purely Fire-type Pokemon with sturdy Attack, Special Attack, and Speed. Their counterparts, Vulpix and Ninetales, were one of the first Pokemon to receive regional variants back in Generation 7, going from Fire-type to Ice and Ice/Fairy-type. It wasn't until Generation 8 that Growlithe and Arcanine were finally given a regional form and a new typing: Fire/Rock-type.
Hisuian Growlithe and Arcanine's stats aren't too different from their non-Hisuian counterparts. They get a little boost in HP and Attack in exchange for their Special Attack and Speed. However, regional variants weren't the only thing added to the Pokemon franchise in Pokemon Legends: Arceus. New types of Pokemon called Alpha Pokemon roam the Hisui region. These are Pokemon that are much larger and have 3 out of 5 EVs at level 3 upon capture. Naturally, players can catch their own Alpha Hisuian Growlithe if they search around Hisui.
It has been rumored that a special distribution event for Pokemon Legends: Arceus will occur from February 25 through March 13, and will give players a Hisuian Growlithe and 20 Feather Balls (this has yet to be officially confirmed, however).
Pokemon Legends: Arceus — How to Get Weavile
Players won't be able to find Hisuian Growlithe until they unlock the Cobalt Coastlands. In order to get there, they'll need to have calmed both the Noble Kleavor and the Noble Liligant. After this, Kamado will send the player's character to the Cobalt Coastlands to help Irida and the Pearl Clan.
Hisuian Growlithe can be found at Veilstone Cape or Windbreak Stand (refer to the star stamps on the above image).
There's usually one Hisuian Growlithe atVeilstone Cape.
Read more on gamerant.com