The U.S. Pokémon Center just added four new plush from the Hisui region found in Pokémon Legends: Arceus. 

Wyrdeer: $19.99, 12 1/2 inches

Basculegion: $19.99, 15 inches

Braviary: $19.99, 10 1/4 inches

Growlithe: $16.49, 9 3/4 inches (currently sold out)

It looks like the Pokémon Center did not put a limit on the number you can purchase, which is likely why the Growlithe plush is already sold out. Hopefully we see it again and the actual collectors can buy one, not the scalpers. 

Photo courtesy of the U.S. Pokémon Center.