Mitsumi is Hareta's traveling companion who is known for being quite good at Pokémon Contests. She was the strongest member of Team Galactic until she defected. She gave the National Pokédex to Hareta in the bonus scene at the end of the Diamond and Pearl Adventure! book.
Leafeon is a Pokémon that works well with Infernape in battles as well as contests.
Glaceon briefly shown in the last book of Pokemon Diamond and pearl.
It's only shown move is Ice Beam.