Like with most Pokémon games, Pokémon Let's Go, Pikachu! & Let's Go, Eevee! have multiple gyms spread across the region. This page is to detail all the gyms, and the Gym Leaders and their Pokémon.

Gym 1: Pewter City

Location: Pewter City
Gym Leader: Brock
Specialty: Rock-type
Reward: Boulder Badge, TM01

The first gym is located within Pewter City. This gym requires you to have a Grass-type Pokémon or a Water-type Pokémon in your team as you enter to show that you can take the Gym on, but it is not required for battle. The gym doesn't have a puzzle but you can navigate around the trainers to go straight to Brock if so wished. Defeating him earns the Boulder Badge which allows traded Pokémon up to Level 20 to obey, as well as TM01, Headbutt.

Gym Leader Brock GeodudeOnix
Battle Type

Items
Level 11Level 12


Attacks:
Tackle


Attacks:
Headbutt
Bind
Rock Throw
Gym 2: Cerulean City

Location: Cerulean City
Gym Leader: Misty
Specialty: Water-type
Reward: Cascade Badge, TM29

The next gym is in Cerulean City and is focused on Water-type Pokémon. To get into the Gym, you need to show a Pokémon that is Level 15 or higher. Like the previous Gym, there's no puzzle but you can skip various trainers to get directly to Misty. Defeating her earns the Cascade Badge which allows traded Pokémon up to Level 30 to obey, as well as TM29, Scald.

Gym Leader Misty PsyduckStarmie
Battle Type

Items
Level 18Level 19


Attacks:
Water Gun
Confusion

Attacks:
Scald
Psywave
Swift
Gym 3: Vermilion City

Location: Vermilion City
Gym Leader: Lt. Surge
Specialty: Electric-type
Reward: Thunder Badge, TM36

The next gym is in Vermilion City and can only be accessed after you have learned the Chop Down Secret Technique from the captain of the S.S. Anne. Once that has been obtained you can enter Vermilion Gym with no further requirements. This Gym has a puzzle where you need to press two consecutive buttons in trash cans, but if you press the wrong trash can after the first, it resets and you need to find it again. The first trash can is always next to one of the two coloured trash cans. Defeating him earns the Thunder Badge which allows traded Pokémon up to Level 40 to obey, as well as TM36, Thunderbolt.

Gym Leader Lt. Surge VoltorbMagnemiteRaichu
Battle Type

Items
Level 25Level 25Level 26



Attacks:
Thunderbolt
Swift
Light Screen
Attacks:
Thunderbolt
Sonic Boom

Attacks:
Thunderbolt
Quick Attack
Double Kick
Gym 4: Celadon City

Location: Celadon City
Gym Leader: Erika
Specialty: Grass-type
Reward: Rainbow Badge, TM53

The next gym is in Celadon City, in the south-west of the city, and has a special restriction before entering. To get into the Gym, you need to show that you have a cute Pokémon. Thankfully, your partner Pikachu or Eevee will suffice for this. This gym doesn't have a puzzle but has a winding maze with multiple paths which can lead you back to the entrance. You'll need to use Chop Down as well. In the middle of the gym you will find the leader, Erika. Defeating her earns the Rainbow Badge which allows traded Pokémon up to Level 50 to obey, as well as TM53, Mega Drain.

Gym Leader Erika TangelaWeepinbellVileplume
Battle Type

Items
Level 33Level 33Level 34



Attacks:
Mega Drain
Sleep Powder
Bind
Attacks:
Mega Drain
Poison Jab

Attacks:
Mega Drain
Moonblast

Gym 5: Fuchsia City

Location: Fuchsia City
Gym Leader: Koga
Specialty: Poison-type
Reward: Soul Badge, TM27

The next gym is in Fuchsia City. To gain entrance to this gym, you need to have at least 50 species of Pokémon registered into your Pokédex. When in the gym, you need to navigate your way to the middle to find Koga. However, there are invisible walls which can only sometimes be seen due to smoke, creating a maze like structure in the gym. When in the middle, you meet Koga. Defeating him earns the Soul Badge which allows traded Pokémon up to Level 60 to obey, as well as TM27, Toxic.

Gym Leader Koga WeezingMukGolbatVenomoth
Battle Type

Items
Level 43Level 43Level 43Level 44




Attacks:
Toxic
Protect
Sludge Bomb
Explosion
Attacks:
Toxic
Protect
Sludge Bomb
Moonblast
Attacks:
Toxic
Protect
Fly
Leech Life
Attacks:
Sludge Bomb
Protect
Psychic
Bug Buzz
Gym 6: Saffron City

Location: Saffron City
Gym Leader: Sabrina
Specialty: Psychic-type
Reward: Marsh Badge, TM33

The next gym is in Saffron City after you have removed Team Rocket from Silph Co.. This gym requires you to have a Pokémon Level 45 or higher to enter. This Gym is a warp-tile puzzle where you have to make your way to the top skyscraper where Sabrina is, battling trainers along the way. When at the top, you'll find Sabrina. Defeating her earns the Marsh Badge which allows traded Pokémon up to Level 70 to obey, as well as TM33, Calm Mind.

Gym Leader Sabrina Mr. MimeSlowbroJynxAlakazam
Battle Type

Items
Level 43Level 43Level 43Level 44




Attacks:
Psychic
Reflect
Light Screen
Double Slap
Attacks:
Psychic
Yawn
Surf
Calm Mind
Attacks:
Psychic
Lovely Kiss
Ice Punch
Attacks:
Psychic
Night Shade

Gym 7: Cinnabar Island

Location: Cinnabar Island
Gym Leader: Blaine
Specialty: Fire-type
Reward: Volcano Badge, TM46

The next gym is on Cinnabar Island. To get into it, you need to retrieve the Secret Key from the nearby Pokémon Mansion. This key will unlock the gym. When inside, the Gym is set up as a game show and Blaine will challenge you to various questions. You need to get 5 Blaine Dolls and to get them, you need to answer 5 questions. If you get them correct, you get a Blaine Doll. If you get them incorrect, you get a trainer battle which will then get you a Blaine Doll.
Question 1: Which of these is the Spitfire Pokémon? Answer: Magmar
Question 2: How many Gym Badges certified by the Pokémon League are there? Answer: Eight
Question 3: A Steel-type move used on a Fire-type Pokémon will be...? Answer: Not very Effective
Question 4: True or false! TM28 contains the move Tombstony. Answer: False / What's That?!
Question 5: Challenger, tell me... who are you about to battle?! Answer: All are correct
With 5 Blaine Dolls, you can then challenge Blaine. Defeating him earns the Volcano Badge which allows traded Pokémon up to Level 80 to obey, as well as TM46, Fire Blast.

Gym Leader Blaine MagmarRapidashNinetalesArcanine
Battle Type

Items
Level 47Level 47Level 47Level 48




Attacks:
Flamethrower
Low Kick
Confuse Ray
Attacks:
Flare Blitz
Quick Attack
Fury Attack
Attacks:
Fire Blast
Quick Attack

Attacks:
Flare Blitz
Outrage
Crunch
Gym 8: Viridian City

Location: Viridian City
Gym Leader: Giovanni
Specialty: Ground-type
Reward: Earth Badge, TM41

The next gym is in Viridian City. This Gym is originally vacant but after defeating Team Rocket and earning 7 badges, the Gym will be filled again, but first you need to meet with Blue and your Rival and receive the Mega Stones from Blue in Oak's lab. Once done, the gym leader returns to the Gym. This gym has a moving tile puzzle where you need to navigate to the end where the Gym Leader appears. This Gym Leader is the Team Rocket Boss, Giovanni, who has retreated to the gym to rebuild Team Rocket. Defeating him earns the Earth Badge which allows traded Pokémon up to Level 100 to obey, as well as TM41, Earthquake.

Gym Leader Giovanni DugtrioNidoqueenNidokingRhydon
Battle Type

Items
Level 49Level 49Level 49Level 50




Attacks:
Earthquake
Sucker Punch
Slash
Attacks:
Earthquake
Super Fang
Crunch
Attacks:
Earthquake
Horn Drill
Megahorn
Poison Jab
Attacks:
Earthquake
Rock Slide
Megahorn
 
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