Grimer was caught by Moon so she could understand its poison and its properties. She wanted to use its poison to make medicine and have a good understanding of it. Because of this, Moon developed a love for Poison-types. Grimer was used in the Full Force Festival in a match against Gladion. During the first match, Grimer was up against Gladion's Porygon. Moon mentioned during the battle that she especially likes Alolan Grimer due to its cute colors, to which the others look at her in shock.