While his first appearance was in Camping It Up!, he didn't receive a speaking role until Ghoul Daze!. He paired up with Brock for the fourth day activity, in which students had to find the Summit Medal in the Summit Ruins at night. As the path leading to the ruins is inhabited by many Ghost-type Pokémon, Mitchell was afraid though Brock taught him how to befriend any type of Pokémon by giving them food.
This listing is of Mitchell's known Pokémon:
| Mitchell's Elekid was not seen until the end of the Summer School Academy. It was seen watching the campfire during the closing ceremony, along with some other people who participated in the academy.
None of Elekid's moves are known.
|Debut||One Team, Two Team, Red Team, Blue Team|
| Slakoth was temporarily owned by Mitchell during the first day of the Summer School Academy.
None of Slakoth's moves are known.
|Debut||Camping It Up!|
| Azumarill was used by Mitchell for the second leg of the triathlon in which all participants had to choose a Water-type Pokémon to cross the lake.
None of Azumarill's moves are known.
|Debut||One Team, Two Team, Red Team, Blue Team!|
Mitchell has competed in the following Pokémon competitions: