Santa Claus' Stantler was used to pull Santa's sleigh and deliver the presents on Christmas, it was a replacement for Ponyta. It was seen near a cabin where Ash and his friends were staying. They heard a noise and stepped outside to find that Stantler was ill. Santa told them that they needed to find a certain Berry to cure Stantler of its fever. The group started to search for it and the Pokémon found the plant atop a mountain. Pikachu picks it and they feed it to Stantler, who quickly perks up and proceeds off into the sky.
None of Stantler's moves were shown.