The Pokemon Center has a ½ scale Arcanine plush available for pre-order from the official website.
Pokemon Brilliant Diamond and Pokemon Shining Pearl will come out on November 19, 2021, whereas Pokemon Legends: Arceus will come out on January 28, 2022.
The Arcanine plush is 150 x 60 x 70 centimeters and weighs about 5250 grams.
Unfortunately, the item is only available from the Japanese Pokemon Center shop.