Koga

“	Fwahahaha! A mere child like you dares to challenge me? That very idea makes me shiver with mirth! Very well, I shall show you true terror as a ninja master! Opponents can't lay a hand on me, as poison brings their steady doom. Despair as you feel the creeping horror of Poison-type Pokémon!	”
–Koga, Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!

Koga served as the Gym Leader at the Fuchsia City Gym. Two years later, during the Generation II games, Koga also became a member of the Elite Four and his daughter, Janine took over his gym and used Poison-type Pokémon as well.

He specializes in Poison-type Pokémon, and as a Gym Leader gave out the Soul Badge for Trainers that could defeat him.

Appearance

Red, Green and Blue

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Yellow

His outfit in Yellow is the same as it is in Red, Green and Blue.

Gold and Silver

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Crystal

His outfit in Crystal is the same as it is in Gold and Silver.

FireRed and LeafGreen

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HeartGold and SoulSilver

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Let's Go, Pikachu! and Let's Go, Eevee!

Koga has black, spikey hair and bushy eyebrows. He is always wearing a red scarf over his mouth and nose. He has a purple ninja-style outfit, with black finger gloves and boots. He has a white belt around his waist.

Personality

Koga shows himself as an intimidating foe, using Poison-type Pokémon, whose moves poison or lull the opponent to sleep.

Biography

Games

Red, Green and Blue

Koga first appears in the games as the Fuchsia City Gym Leader. His gym was constructed with an array of invisible walls, fashioned into a maze. This forces the player to walk through the maze fighting Gym members, with the destination in the middle where Koga awaits.

Yellow

His role in Yellow is the same as it is in Red, Green and Blue.

Gold and Silver

Later, in the Generation II games, Koga has been promoted to Elite Four status. With the absence of a Gym Leader at Fuchsia Gym, Koga leaves the Gym under his daughter's care, Janine, making her the new Gym Leader.

Crystal

His role in Crystal is the same as it is in Gold and Silver.

FireRed and LeafGreen

In the remakes of the original games, Pokémon FireRed and LeafGreen, Koga is once again a Gym Leader, as it takes place during the same time period. The only difference is the level of his Weezing, and his updated appearance.

HeartGold and SoulSilver

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Other appearances

Sprites

Pokémon

Red and Blue

Koffing		Koffing		Muk		Weezing		[[File:{{{P5}}}_RB.png\|link={{{P5}}}]] [[]]	[[File:{{{P6}}}_RB.png\|link={{{P6}}}]] [[]]
Lv. 37	-	Lv. 37	-	Lv. 39	-	Lv. 43	-	Lv. ?	-	Lv. ?	-

Item:		Item:		Item:		Item:		Item: ?	Item: ?
Tackle		SmokeScreen		Disable		Sludge		-	-
Smog		Sludge		Poison Gas		Smog		-	-
Sludge		Smog		Minimize		Toxic		-	-
SmokeScreen		Tackle		Sludge		Self-Destruct		-	-

Yellow

Venonat		Venonat		Venonat		Venomoth		[[File:{{{P5}}}_Y.png\|link={{{P5}}}]] [[]]	[[File:{{{P6}}}_Y.png\|link={{{P6}}}]] [[]]
Lv. 44	-	Lv. 46	-	Lv. 48	-	Lv. 50	-	Lv. ?	-	Lv. ?	-

Item:		Item:		Item:		Item:		Item: ?	Item: ?
Toxic		Psybeam		Sleep Powder		Psychic		-	-
Tackle		Toxic		Psychic		Double Team		-	-
Sleep Powder		Psychic		Toxic		Leech Life		-	-
Psychic		Supersonic		Double-Edge		Toxic		-	-

Gold, Silver & Crystal

Ariados		Forretress		Muk		Venomoth		Crobat		[[File:{{{P6}}}_C.png\|link={{{P6}}}]] [[]]
Lv. 40	♂	Lv. 43	♂	Lv. 42	♂	Lv. 41	♂	Lv. 44	♂	Lv. ?	-
Ability:		Ability:		Ability:		Ability:		Ability:		Ability: Unknown

Item: None		Item: None		Item: None		Item: None		Item: None		Item: ?
Spider Web		Protect		Sludge Bomb		Toxic		Double Team		-
Double Team		Spikes		Acid Armor		Psychic		Wing Attack		-
Baton Pass		Swift		Minimize		Gust		Quick Attack		-
Giga Drain		Explosion		Toxic		Supersonic		Toxic		-

FireRed and LeafGreen

Koffing		Koffing		Muk		Weezing		[[File:{{{P5}}}_BW.gif\|link={{{P5}}}]] [[]]	[[File:{{{P6}}}_BW.gif\|link={{{P6}}}]] [[]]
Lv. 37	♂	Lv. 37	♂	Lv. 39	♂	Lv. 43	♂	Lv. ?	-	Lv. ?	-
Ability: Levitate		Ability: Levitate		Ability: Sticky Hold		Ability: Levitate		Ability: Unknown		Ability: Unknown

Item: None		Item: None		Item: None		Item: None		Item: ?	Item: ?
Sludge		Self-Destruct		Minimize		Toxic		-	-
Self-Destruct		Sludge		Toxic		SmokeScreen		-	-
SmokeScreen		Toxic		Sludge		Tackle		-	-
Toxic		SmokeScreen		Acid Armor		Sludge		-	-

HeartGold and SoulSilver

Ariados		Forretress		Muk		Venomoth		Crobat		[[File:{{{P6}}}_BW.gif\|link={{{P6}}}]] [[]]
Lv. 40	♂	Lv. 43	♂	Lv. 42	♂	Lv. 41	♂	Lv. 44	♂	Lv. ?	-
Ability: Insomnia		Ability: Sturdy		Ability: Sticky Hold		Ability: Shield Dust		Ability: Inner Focus		Ability: Unknown

Item: None		Item: None		Item: Black Sludge		Item: None		Item: Sitrus Berry		Item: ?
Spider Web		Protect		Gunk Shot		Toxic		Double Team		-
Poison Jab		Toxic Spikes		Screech		Psychic		Wing Attack		-
Baton Pass		Swift		Minimize		Gust		Quick Attack		-
Giga Drain		Explosion		Toxic		Supersonic		Poison Fang		-

Skuntank		Toxicroak		Swalot		Muk		Venomoth		Crobat
Lv. 61	♂	Lv. 60	♂	Lv. 62	♂	Lv. 62	♂	Lv. 63	♂	Lv. 64	♂
Ability: Aftermath		Ability: Dry Skin		Ability: Sticky Hold		Ability: Sticky Hold		Ability: Tinted Lens		Ability: Inner Focus

Item: None		Item: None		Item: Leftovers		Item: Black Sludge		Item: None		Item: None
Toxic		Gunk Shot		Amnesia		Toxic		Baton Pass		Cross Poison
Sucker Punch		Swagger		Sludge Bomb		Minimize		Double Team		Fly
Dig		X-Scissor		Pain Split		Screech		Silver Wind		Mean Look
Explosion		Cross Chop		Yawn		Swagger		Psychic		Toxic

Let's Go, Pikachu! and Let's Go, Eevee!

Weezing		Muk		Golbat		Venomoth		[[File:{{{P5}}}_BW.gif\|link={{{P5}}}]] [[]]	[[File:{{{P6}}}_BW.gif\|link={{{P6}}}]] [[]]
Lv. 43	-	Lv. 43	-	Lv. 43	-	Lv. 44	-	Lv. ?	-	Lv. ?	-
Ability:		Ability:		Ability:		Ability:		Ability: Unknown		Ability: Unknown

Item: None		Item: None		Item: None		Item: None		Item: ?	Item: ?
Toxic		Toxic		Toxic		Sludge Bomb		-	-
Protect		Protect		Protect		Protect		-	-
Sludge Bomb		Sludge Bomb		Fly		Psychic		-	-
Explosion		Moonblast		Leech Life		Bug Buzz		-	-

Tentacruel		Golbat		Weezing		Venomoth		Muk		[[File:{{{P6}}}_BW.gif\|link={{{P6}}}]] [[]]
Lv. 56	-	Lv. 56	-	Lv. 56	-	Lv. 56	-	Lv. 57	-	Lv. ?	-
Ability:		Ability:		Ability:		Ability:		Ability:		Ability: Unknown

Item: None		Item: None		Item: None		Item: None		Item: None		Item: ?
Hydro Pump		Crunch		Fire Blast		Mega Drain		Sludge Bomb		-
Toxic		U-turn		Thunder		Sludge Bomb		Moonblast		-
Sludge Bomb		Fly		Sludge Bomb		Psychic		Mega Drain		-
Mega Drain		Leech Life		Toxic		Bug Buzz		Dark Pulse		-

Stadium

Venomoth		Muk		Weezing		Venonat		Nidorina		Nidorino
Lv. 50	-	Lv. 50	-	Lv. 50	-	Lv. 50	-	Lv. 50	-	Lv. 50	-
Ability:		Ability:		Ability:		Ability:		Ability:		Ability:

Item:		Item:		Item:		Item:		Item:		Item:
Mega Drain		Sludge		SmokeScreen		Stun Spore		Double Kick		Fury Attack
Sleep Powder		Minimize		Sludge		Sleep Powder		Thunder		Thunderbolt
Psybeam		Poison Gas		Thunderbolt		Psychic		Ice Beam		BubbleBeam
Double-Edge		Hyper Beam		Fire Blast		Mega Drain		Toxic		Toxic

Venomoth		Muk		Weezing		Hypno		Tangela		Parasect
Lv. 50	-	Lv. 50	-	Lv. 50	-	Lv. 50	-	Lv. 50	-	Lv. 50	-
Ability:		Ability:		Ability:		Ability:		Ability:		Ability:

Item:		Item:		Item:		Item:		Item:		Item:
Mega Drain		Sludge		SmokeScreen		Hypnosis		Stun Spore		Spore
Stun Spore		Minimize		Sludge		Psychic		Double Team		Slash
Psychic		Hyper Beam		Toxic		Counter		Rest		Mega Drain
Hyper Beam		Toxic		Fire Blast		Seismic Toss		Solar Beam		Growth

Stadium 2

Venomoth		Ariados		Golbat		Gligar		Electrode		Muk
Lv. 50	♀	Lv. 50	♂	Lv. 50	♀	Lv. 50	♂	Lv. 50	-	Lv. 50	♀
Ability:		Ability:		Ability:		Ability:		Ability:		Ability:

Item: Focus Band		Item: Ice Berry		Item: PRZCureBerry		Item: Mint Berry		Item: Bitter Berry		Item: Burnt Berry
Toxic		Spider Web		Toxic		Sandstorm		Toxic		Sludge Bomb
Double Team		Dig		Double Team		Iron Tail		Double Team		Fire Blast
Giga Drain		Double Team		Wing Attack		Double Team		Mirror Coat		Double Team
Psychic		Toxic		Detect		Toxic		Thunder		Toxic

Venomoth		Magmar		Lapras		Stantler		Lanturn		Ariados
Lv. 50	♀	Lv. 50	♂	Lv. 50	♀	Lv. 50	♂	Lv. 50	♂	Lv. 50	♂
Ability:		Ability:		Ability:		Ability:		Ability:		Ability:

Item: BrightPowder		Item: Miracle Berry		Item: Leftovers		Item: Mystery Berry		Item: Quick Claw		Item: Focus Band
Double Team		Flamethrower		Double Team		Earthquake		Double Team		Spider Web
Toxic		Confuse Ray		Surf		Confuse Ray		Toxic		Psybeam
Psybeam		Toxic		Confuse Ray		Toxic		Confuse Ray		Baton Pass
Baton Pass		Double Team		Toxic		Double Team		Thunderbolt		Double Team

Trivia

Koga's name derives from Kōga-ryū, a school of ninjutsu that focused on, among other techniques, poisoning. Kyō, his Japanese name, may come from 凶 (kyō, misfortune), 戮 (kyō, kill), or 杏 (kyō, apricot, as apricot seeds are poisonous).
In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee! after you rematch him he says that he has also been aiming to join the Elite Four, referencing to him being in the Johto elite four.