[Psychic, Fire, and Ground Type Moves are good against Koga's Team]
"Fwahahahaha! I am Koga of the Elite Four. I live in shadows, a ninja! My intricate style will confound and destroy you! Confusion, sleep, poison... Prepare to be the victim of my sinister technique! Fwahahahaha! Pokemon is not merely about brute force--you shall see soon enough!"
  
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 Koga: 

 Ariados: 

 Level: 
 40
 Type: 
 Bug|Poison
 Ability: 
Insomnia - Prevents the Pokemon from falling asleep.
 Moves: 
Spider Web
Baton Pass
Giga Drain
Poison Jab
 Review: 
 Ariados can switch out of battle by using Baton Pass. It can use Spider Web to prevent the
opponent from switching the Pokemon. It shouldn't be a problem if you planned ahead and
put a Pokemon that would do well against it. It's offensive attacks are Poison Jab and
Giga Drain. Poison Jab may poison your Pokemon and Giga Drain will do dmaage to your
Pokemon and half of the damage will be used to recover Ariados's HP.
 Venomoth: 

 Level: 
 41
 Type: 
 Bug|Poison
 Ability: 
Shield Dust - Blocks the added effects of attacks taken.
 Moves: 
Psychic
Gust
Supersonic
Toxic
 Review: 
 You may get annoyed with this Pokemon if you let it use Supersonic andor Toxic. Toxic will
poison your Pokemon and it builds up the damage it does each turn. Supersonic will confuse
your Pokemon. Then it has Psychic which is strong and may lower your Pokemon's Special
Defense. Gust will do double damage if the target is currently using Fly or Bounce. If
not, it's a weak move.
 Muk: 

 Level: 
 42
 Type: 
 Poison
 Item: 
 Black Sludge
 Ability: 
Sticky Hold - Protects the Pokemon from item theft.
 Moves: 
Gunk Shot
Minimize
Screech
Toxic
 Review: 
 Muk is even more annoying. It likes to use Minimize a lot [at least on me]. It raises it's
Evasion so you're less likely to attack + the fact that it is holding Black Sludge so it
can recover HP each turn. Screech will lower your Defense...useless while Toxic will
poison you. Gunk Shot is super strong and may poison your Pokemon as well.
 Forretress: 

 Level: 
 43
 Type: 
 Bug|Steel
 Ability: 
Sturdy - The Pokemon is protected against 1-hit KO attacks.
 Moves: 
Toxic Spikes
Protect
Swift
Explosion
 Review: 
 *gasp* It isn't a Poison Type Pokemon! Anyway, it does have "Toxic" Spikes. It poisons any
Pokemon who switches into battle. Then it has Protect to negate any attacks for that turn.
Swift is .... decent at this point and always hits. Explosion will do extreme damage to
your Pokemon [maybe] and the one who uses it will be KO'ed.
 Crobat: 

 Level: 
 44
 Type: 
 Poison|Flying
 Item: 
 Sitrus Berry
 Ability: 
Inner Focus - The Pokemon is protected from flinching.
 Moves: 
Double Team
Quick Attack
Wing Attack
Poison Fang
 Review: 
 Double Team is exactly like Minimize and you will get really annoyed. Quick Attack
shouldn't be a problem for you. Wing Attack is about as good a Swift except that is
doesn't always hit. Poison Fang may poison your Pokemon and is pretty decent as well.
"Ah! You've proven your worth!"
Gained 5080 Pokedollars!
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"I subjected you to everything I could muster. But my efforts failed. I must hone my
skills. Go on to the next room, and put your abilities to test!"
 Fun Facts: 
-Koga has appeared in all 4 Generations
-Koga is originally a Gym Leader of Fuchsia City in Kanto.
-Koga's daughter is Janine.
 Wesites: 
Bulbapedia