Koga has studied medicine and antidotes; he makes his own potions to heal his Pokémon. He also serves as a teacher. Many students come to him to be trained in the arts of Ninjutsu and Pokémon. One of his students is his own daughter, Janine, who takes over his Gym in GenerationsII and IV storyline. In addition to these roles, Koga also patrols the grounds of the Kanto Safari Zone, to ensure that the players of the Safari Game are safe from the wild Pokémon within.
In Generations I, III, and VII, Koga's Gym is typically the fifth Gym to be challenged. He has built invisible walls in the Fuchsia City Gym, constructing a confusing maze out of them. Koga awaits challengers in the center of the maze, clearly visible, but a group of Koga's students must be fought first. Defeating him will earn the successful Trainer the TM for Toxic and the Soul Badge.
With the future of the Gym in his daughter's hands, Koga advances to a role in the Pokémon League of Kanto and Johto before the events of Generations II and IV. In these games, he is the second member of the Elite Four to be faced. The team he uses in this role is similar to his Gym Leader's teams; the main difference is the introduction of Pokémon not native to Kanto. Koga's battle style as an Elite Four member is designed to confound and destroy his opponent in battle. Rather than using brute force, Koga attempts to confuse, put to sleep, and poison his opponent.
This is a list of the Fame Checker's information on Koga in Pokémon FireRed and LeafGreen Versions.
Fuchsia City - Sign
What does this person do?
"Fuchsia City Pokémon Gym
The Poisonous Ninja Master"
Fuchsia Gym - Koga
Favorite kind of Pokémon?
"Despair to the creeping horror of Poison-type Pokémon!"
"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! Pokémon is not merely about brute force--you shall see soon enough!"
"Ah! You have proven your worth!"
After being defeated
"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!"
"Fwahahaha! A mere child like you dares to challenge me? The very idea makes me shiver with mirth! Very well, I shall show you true terror as a ninja master! Poison brings steady doom. Sleep renders foes helpless. Despair to the creeping horror of Poison-type Pokémon!"
"Humph! You have proven your worth! Here! Take the SoulBadge!"
After being defeated
"Now that you have the SoulBadge, the Defense of your Pokémon rises. It also lets you Surf outside of battle. Ah! Take this, too!"
"Sealed within that TM lies Toxic! It is a secret technique dating back some four hundred years."
"When afflicted by Toxic, a Pokémon suffers more and more. It suffers worsening damage as the battle wears on! It will surely terrorize foes!"
"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 techniques! Fwahahahaha! Pokémon are not merely about brute force--you shall see soon enough!"
After sending out last Pokémon
"One Pokémon left? Ha ha ha! I've been counting on this one from the very beginning!"
When last Pokémon is at critical health
"Ah! You've proven your worth!"
After being defeated
"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 the test!"
"Yo! Champ in the making! We have the Safari Zone here in Fuchsia City, where you can meet tons of different Pokémon! And at the Fuchsia City Gym, we welcome Trainers who've met lots of Pokémon, so... I'll need to see if you’ve managed to catch at least 50 species of Pokémon! ..."
If the player hasn't caught enough Pokémon
"You've caught... <number of caught Pokémon> species! Unfortunately, you haven't made it to 50 species yet... Go catch some more Pokémon and then come back! The Fuchsia City Gym is always open!"
If the player has caught enough Pokémon
"Well done! Looks like you've caught <number of caught Pokémon> species! That means you are now worthy of challenging my Gym! ..."
After qualifying to challenge the Gym
"Fwahahahaha! Startled by my disguise, are you? I shall use my intricate style to confound and destroy you in battle, as well!"
"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!"
"Hmph! You have proven your worth!"
After being defeated
"Here! Take a Soul Badge!"
"Now that you have a Soul Badge, Pokémon up to Lv. 60 will heed your command if you received them in a trade. Ah! Take this, too."
"Sealed within that TM27 lies the move Toxic! It is an ancient move, passed down through my family for 400 years. When hit with Toxic's poisonous effects, a Pokémon will take more and more damage with each turn that passes in battle! It will surely terrorize your opponent!"
"Fwahahaha! If it isn't the child. It seems we are fated to meet once again. You have come at a truly opportune time. I was just thinking that I wanted to test my newly refined sinister techniques... in a battle that will end in your utter defeat!"
Before battle (subsequent rematches)
"Fwahahaha! Today I'll not only defeat you, but I will also demonstrate my fatherly dignity to my daughter!"
"...If I am not strong enough to defeat you now, there is but one thing to do. I must hone my skills."
After being defeated
"With Trainers like you and <rival>, the Pokémon League must be a place of formidable strength! Truly, it is something to be proud of! As it so happens, I have been thinking of aiming to join the Elite Four myself..."
Koga is dedicated to perfecting his battling techniques. Like the traps in his Gym, he attempts to confuse and disorientate his opponents to get the upper hand during a match.
This article is missing information on this character's Japanese voice actor. You can help by adding this information.
This listing is of Koga's known Pokémon in the anime:
Venonat → Venomoth
When Ash challenged Koga, Koga sent out his Venonat, which Ash originally underestimated since he had previously defeated his Aya's Venonat quite easily but then it instantly evolved into a Venomoth, and proceeded to get the upper hand in its Gymbattle with Pidgeotto. The battle was interrupted by Team Rocket, and afterwards, Koga offered to trade Venomoth to Misty for her Psyduck, but she declined.
Koga keeps these multiple Voltorb as traps in his Gym. They can be either hidden under the floor or be dropped from the ceiling. Ash, Misty, and Brock first came across one when Ash fell into a trap, stepped on one and it shocked him. Team Rocket attempted to steal the Voltorb from the Gym, and Meowth used these Pokémon as exploding bowling balls and threw them at the heroes.
The Voltorb's only known move is Self-Destruct, which they usually use when a trap is set off.
Koga is one of the three villainous heads of Team Rocket, and serves under Giovanni.
Koga debuts in Raging Rhydon, where he is searching the Moon Stone in Mt. Moon. Here, Koga fights with Red and Misty and forces his Rhyhorn to evolve with a mysterious injection, revealing what happened to Misty's Gyarados when it was kidnapped, but the mission fails. Koga later tries to bump off Red in Lavender Town's Pokémon Tower, and uses a Gastly to reanimate the corpses of dead Pokémon buried there. He also attacks Red with his Arbok. However, Blue has his Charmeleon slice Arbok in half. Under his boss's orders, he captures Articuno and brings it to Saffron City. He is once again defeated by Blue at Silph Co., albeit that he almost killed both of them by not allowing them to reach their Poké Balls by using his Muk, then almost freezing them to death with his Articuno. After he is defeated and knocked out, Red gets Koga's Soul Badge and Blue uses his special Golbat to find out where Team Rocket is holding his grandfather.
Koga helps the Pallet Town Trainers in the fight against the Elite Four at Cerise Island. Koga is paired with Blue and battles Agatha, but Blue first returns his Golbat to him. When the two of them finally meet Agatha, she separates them, making Blue and Koga's Golbat that he got paired up with again face Agatha's Golbat. Meanwhile, Koga's Arbok had to face Agatha's Arbok which could change its patterns allowing it to gain the upper hand over Koga. When Blue was paralyzed from a Haunter's Lick, Koga started throwing his shuriken balls. Agatha thought this was a desperate tactic, but in reality they were Pokémon holding Parlyz Heals. Koga was hoping just one of them would get to Blue, which it did. Blue then joins him, and Koga commands his Golbat to use Leech Life on himself. His blood is then put on Arbok's torso to prevent its ability to change its pattern. Without Arbok's ability, Agatha was seemingly defeated.
However, in reality, Agatha just pretended to be defeated and had her Gengar masquerade as Koga and Blue's shadow to slowly suck the life out of them hidden due to Koga's quick loss of blood. After traveling through the maze for a while, they found themselves back where they started with Agatha nowhere to be found. They then figured out her plan and defeated the Gengar, but not before Koga is nearly swept in the collapsing terrain of the destroyed battleground. He narrowly escapes using his Muk to defend him in his wounded state.
Unlike the other two Rocket Admins, who were instructed to return and manage their Gyms, Koga was not even reached by Giovanni. He then disappears for a time, leaving his daughter Janine in charge of the Gym. Janine is worried for her father, but opposes his criminal ties. Later, Koga reappeared with a new partner, Bruno, who had saved Koga when Cerise was about to collapse. They trained together for a while and both of them later met their former opponents Red and Blue, whose Rhydon was drilling underground towards Ilex Forest. Towards the end of the series, Koga and Bruno found Will and Karen in the Ilex Forest and persuaded them to work together. The new Elite Four is formed.
This section is incomplete. Please feel free to edit this section to add missing information and complete it.
The new Elite Four appears in this chapter.
This is a listing of Koga's Pokémon in the Pokémon Adventures manga.
Rhyhorn → Rhydon
Koga's Rhydon was introduced as a Rhyhorn, where it fought against Red and Pika. When it was losing, Koga injected in with a mysterious needle, forcing it to evolve. In its evolved form, it was too much for both Red and Misty to handle, and they had to escape the battle by distracting Rhydon with an electrically charged boulder. It hasn't been seen again.
Arbok is one of Koga's most powerful Pokémon. It can regenerate itself even if it's cut in half, so as long as its head remains intact. It was used against both Blue and Agatha. It also possesses the ability to temporarily control a detached body part, such as its tail.
Koga's Golbat is much smaller than the average Golbat. His Supersonic can be used to create a magic mirror for scrying to see things from a distance, even if walls or land are in the way. After Blue defeated Koga at Silph Co., he stole Golbat to locate Professor Oak but later returned him to his rightful owner on Cerise Island.
Koga wears a Grimer on his shoulder in the form of a ninja outfit in Pokémon Adventures. He used him extensively to smother Blue, preventing him from breathing and restricting his movements so that he would be unable to call on his Pokémon.
Koga's Muk was used on Cerise Island to battle the Elite Four, and proved useful in his survival after the island began to crumble. In the HeartGold & SoulSilver chapter, he was used during the Circle Push event of the Pokéathlon.
This Articuno was originally seen at the Seafoam Islands. Even though Red stopped one attempt, Team Rocket was finally able to catch this legendary bird because of its energy loss, and had it sent over for Koga afterwards. During the battle between Red, Blue, Green and Lt. Surge, Koga and Sabrina, it was merged with Zapdos and Moltres to create Thu-Fi-Zer after Sabrina took matters into her own hands. Once defeated and freed, it returned to the wild, where it was later caught by Green alongside its fellow Legendary birds.
He hires a Chansey torturer to kidnap the Chansey as they were valuable to him, something he only cared about. Red sneaks in with Clefairy and Pikachu to take the Chansey. After getting caught though, Koga releases Koffing and Grimer to stall Red and his Pokémon. However, Clefairy defeats them both, one by one, and rescues the Chansey.
In Aim to be the No. 1 Pokémon!!, he was revealed to have registered for the No. 1 Pokémon Contest. His did not have his greed this time and it wore off since then. Koga participates with Ninetales but loses since Ninetales did not dazzle the audience.
After Red's travels in Johto, Koga is revealed to have joined the Johto Elite Four in A Challenge to the Elite Four!. He, along with Will and Bruno fell from the Elite Four Tower, seemly defeated by Karen. Red asks them what happened, but Koga asks him to ask Karen herself. It is later revealed that after being exhausted from training, Karen decided to tell them a joke, and they fell down the building after hearing her dumb joke.
Koga's Pokémon Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.