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Koga is the Leader of the Fushia City gym he uses poison Pokemon and he practices Ninjutsu. He eventually became a member of the Elite Four later on in the series.
Koga is the Leader of the Fushia City gym He is Also the Father of Janine his successor. In the Anime Koga Used a system of Invisible Walls and self destructing Voltorb to confuse trainers, howver his gym was destroyed and he and Ash battled out side the gym resulting in a Ash win. When Ash, May,Max, and Brock traveled back to Kanto Janine was the fushia City gym leader and Koga had been summoned to be an Elite Four member.