The Indigo Disk DLC of Pokémon Scarlet & Violet brings back numerous Legendary Pokémon from previous Generations, and among them is the Ice-type creature Glastrier. Originally part of a Legendary fusion in Gen 8 (Pokémon Sword and Shield), this elusive wild horse makes its appearance through specific quests in the DLC. The version of the game you're playing will dictate the method to encounter and catch Glastrier within the DLC.

Exclusive to Pokémon Scarlet, the quests unlocking Glastrier present a challenge, but there's a way to secure this Legendary Pokémon in Pokémon Violet as well. Similar to the approach for locating the Legendary bird Zapdos, Glastrier can be found on your map once you possess a Treat item associated with the Pokémon. Using this tempting treat draws Glastrier to the region, requiring you to explore the open world to track down the roaming beast. Glastrier frequents the snow-filled ruins of Glaseado Mountain near Glaseado Gym after obtaining the Glastrier Treat item from Snacksworth in Pokémon Scarlet & Violet.

In Pokémon Scarlet, completing 10 Blueberry Solo quests earns you the Glastrier Treat item as a gift from Snacksworth. In Pokémon Violet, a single Group Blueberry quest completion will yield the same item. Blueberry quests are straightforward objectives in the Indigo Disk DLC, involving tasks such as battling trainers or catching Pokémon. While not as challenging as Drayton's Elite Trial, some quests may prove easier to complete than others. Additionally, completing these quests rewards you with Blueberry Points (BP), which can be spent on various items, enhancing area biodiversity, and more.