From Bulbapedia, the community-driven Pokémon encyclopedia.
Mitch (Japanese: ヤマグチ Yamaguchi) is the Club Master of the Fighting Club (Japanese: バトルクラブ Battle Club). He plays using the First-Strike Deck (Japanese: せんせいこうげきデッキ Preemptive Hit Deck) and gives away the Fighting Medal to challengers who defeat him. In Pokémon Card GB2: Here Comes Team GR!, he uses the ドトウのてっけんデッキ Iron Fist of the Billows Deck.
His Fighting Club is a dojo filled with weight training equipment.
In Pokémon Card GB
When first meeting Mitch after defeating the Rock Club's Club Master Gene, he will issue an assignment where the player has to find and defeat his three pupils.
He will accept a challenge after the player defeats his pupils for a Fighting Medal and two Laboratory booster packs.
His deck is based around using only powerful Fighting types. He also uses Pluspower to boost his damage done, and Defender to deter opponent damage. Gust of Wind cards are also utilized to switch healthy opponents with more damaged ones. The best strategy is to use Psychic types like Gastly and its evolution, and Flying type in the deck. They'll resist damage, and the Ghosts will deal a majority of the damage.
In Pokémon Card GB2
At the start of the game, Mitch was kidnapped by Team Great Rocket and later imprisoned in the GR Fighting Fort.
When the player defeats Gōda and frees him at the Fighting Fort, he will award the player with a Cool Porygon.
Afterwards, he will be available for battles anytime with his deck and gives out two Sky Flying Pokémon packs when defeating him.
Before any of the 3 Fighting Club members have been defeated: "I am Mitch, the Master of the Fighting Club!"
"I have to warn you that you will not be able to defeat me!"
"If you wish to duel with me, you must defeat my pupils first!"
"My pupils are training at other Clubs!"
"Go see if you can defeat all 3 of my pupils!"