Gumshoos first appeared in Verdant Cavern in SM009, where Ash battled against it in his first Island Trial. Gumshoos was quickly defeated after Pikachu attacked it with Iron Tail. Gumshoos later helped scare away the AlolanRattata and Raticate in a store. After noticing that the normal Gumshoos had such sharp front teeth, Officer Jenny asked it to join her, seeing as she always wanted a partner, to which Gumshoos agreed.
Gumshoos is a very powerful battler, using its speed and raw strength to overwhelm opponents. Gumshoos is also a kind Pokémon, helping to scare away the AlolanRattata and Raticate. Gumshoos can be a bit a shy, as shown when Officer Jenny first asked it to join her and when Ash's Rotom Pokédex mentioned that its had a 99.7% compatibility with its Trainer. It has also shown to copy what its Trainer does, for instance, when it saluted right after Officer Jenny saluted.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
Trivia
Gumshoos is the only recurring Pokémon used by an Officer Jenny to be shown as a wild Pokémon before an Officer Jenny was shown with one under her ownership.
Related articles
For more information on this Pokémon's species, see Gumshoos.