A gym is a place where Pokémon trainers train their Pokémon. Just like real life gymnasiums, where one goes to build physical strength, Pokémon gyms are places where trainers can go to sharpen their battling skills and where their Pokémon gain experience.
Often specializing in a particular type, gyms create an environment which allows trainers to test both their skills and Pokémon against those of others. The most powerful trainer in a given gym is called the gym leader, who is revered by both the lower-ranking members of the gym and local fans.
Defeating all gym leaders for each region enables the ability to find legendary Pokémon on the maps. You can track your progress from your profile by checking your obtained badges. In addition, there is a row of ribbons which represent the completion of each region. In the past, elite 4 members, champions, battle frontier brains, and battle maison members had to be completed for all legendary Pokémon to become obtainable but is no longer the case after a v4 update.
Indigo League
Gym Leaders
| Pewter City Gym | 
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Brock
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| Cerulean City Gym | 
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Misty
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| Vermilion City Gym | 
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Lt Surge
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| Celadon City Gym | 
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Erika
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| Saffron City Gym | 
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Sabrina
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| Fuchsia City Gym | 
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Janine
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| Cinnabar Island Gym | 
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Blaine
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| Viridian City Gym | 
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Giovanni
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Elite 4
Please Note: While these elite 4 trainers fall under the Indigo section, it is actually shared with the Johto region.
| Elite 4 Member #1 |
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Will
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| Elite 4 Member #2 |
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Koga
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| Elite 4 Member #3 | 
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Bruno
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| Elite 4 Member #4 | 
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Karen
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Champion
| Kanto Champion | 
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Blue
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Orange Islands League
Gym Leaders
| Mikan Island Gym |
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Cissy
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| Navel Island Gym |
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Danny
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| Trovita Island Gym |
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Rudy
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| Kumquat Island Gym |
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Luana
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Head Gym Leader
| Pummelo Island Stadium | 
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Drake  | |||||||
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Johto League
Gym Leaders
| Violet City Gym | 
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Falkner
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| Azalea Town Gym | 
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Bugsy
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| Goldenrod City Gym | 
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Whitney
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| Ecruteak City Gym | 
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Morty
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| Cianwood City Gym |
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Chuck
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| Olivine City Gym | 
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Jasmine
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| Mahogany Town Gym | 
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Pryce
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| Blackthorn City Gym | 
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Clair
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Elite 4
Please Note: While these elite 4 trainers fall under the Johto section, it is actually shared with the Indigo region.
| Elite 4 Member #1 |
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| Will
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|
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| Elite 4 Member #2 |
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| Koga
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|
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| Elite 4 Member #3 |
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| Bruno
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|
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| Elite 4 Member #4 |
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| Karen
| |
|
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Champion
| Johto Champion |
|
Lance
| |
 
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Hoenn League
Gym Leaders
| Rustboro City Gym |
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Roxanne
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| Dewford Town Gym |
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Brawly
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| Mauville City Gym |
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Wattson
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| Lavaridge City Gym |
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Flannery
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| Petalburg City Gym |
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Norman
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| Fortree City Gym |
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Winona
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| Mossdeep City Gym |
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Liza and Tate
| |
  
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| Sootopolis City Gym |
|
Juan
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Elite 4
| Elite 4 Member #1 |
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Sidney
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| Elite 4 Member #2 |
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Phoebe
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| Elite 4 Member #3 |
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Glacia
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| Elite 4 Member #4 |
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Drake
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Champion
| Hoenn Champion |
|
Wallace
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Sinnoh League
Gym Leaders
| Oreburgh City Gym |
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Roark
| |
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| Eterna City Gym |
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Gardenia
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| Veilstone City Gym |
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Maylene
| |
 
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| Pastoria City Gym |
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Crasher Wake
| |
 
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| Hearthome City Gym |
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Fantina
| |
 
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| Canalave City Gym |
|
Byron
| |
 
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| Snowpoint Gym |
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Candice
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| Sunyshore City Gym |
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Volkner
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Elite 4
| Elite 4 Member #1 |
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Aaron
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| Elite 4 Member #2 |
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Bertha
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| Elite 4 Member #3 |
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Flint
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| Elite 4 Member #4 |
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Lucian
| |
  
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Champion
| Sinnoh Champion |
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Cynthia
| |
  
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Unova League
Gym Leaders
| Aspertia City Gym |
|
Cheren
| |
  
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| Virbank City Gym |
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Roxie
| |
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| Castelia City Gym |
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Burgh
| |
   
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| Nimbasa City Gym |
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Elesa
| |
   
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| Driftveil City Gym |
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Clay
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| Mistralton City Gym |
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Skyla
| |
  
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| Opelucid Gym |
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Drayden
| |
 
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| Humilau City Gym |
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Marlon
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Elite 4
| Elite 4 Member #1 |
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Shauntal
| |
  
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| Elite 4 Member #2 |
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Marshal
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| Elite 4 Member #3 |
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Grimsley
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| Elite 4 Member #4 |
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Caitlin
| |
    
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Champion
| Unova Champion |
|
Iris
| |
  
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Kalos League
Gym Leaders
| Santalune City Gym |
|
Viola
| |
 
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| Cyllage City Gym |
|
Grant
| |
 
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| Shalour City Gym |
|
Korrina
| |
 
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| Coumarine City Gym |
|
Ramos
| |
 
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| Lumiose City Gym |
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Clemont
| |
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| Laverre City Gym | 
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Valerie
| |
 
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| Anistar City Gym |
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Olympia
| |
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| Snowbelle City Gym |
|
Wulfric
| |
 
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Elite 4
| Elite 4 Member #1 |
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Wikstrom
| |
  
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| Elite 4 Member #2 |
|
Malva
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| Elite 4 Member #3 |
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Drasna
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| Elite 4 Member #4 |
|
Siebold
| |
 
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Champion
| Kalos Champion |
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Diantha
| |
    
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Alola League
Trial Captains
| Verdant Cave |
|
Ilima
| |
 
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| Brooklet Hill |
|
Lana
| |
  
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| Wela Volcano Park |
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Kiawe
| |
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| Lush Jungle |
|
Mallow
| |
  
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| Hokulani Observatory |
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Sophocles
| |
   
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| Thrifty Megamart |
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Acerola
| |
  
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| Poni Gauntlet |
|
Mina
| |
  
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Island Kahunas
| Iki Town |
|
Hala
| |
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| Konikoni City |
|
Olivia
| |
 
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| Malie City |
|
Nanu
| |
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| Vast Poni Canyon |
|
Hapu
| |
 
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Elite 4
| Elite #1 |
|
| Hala
| |
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| Elite #2 |
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| Olivia
| |
 
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| Elite #3 |
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| Acerola
| |
|
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| Elite #4 |
|
Kahili
| |
  
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Champion
| Alola Champion |
|
Professor Kukui
| |
    
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Galar League
Gym Leaders
| Turffield Gym |
|
Milo
| |
 
| |
| Hulbury Gym |
|
Nessa
| |
  
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| Motostoke Gym |
|
Kabu
| |
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| Stow-on-Side Gym |
|
Allister
| |
  
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| Ballonlea Gym |
|
Opal
| |
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| Circhester Gym |
|
Gordie
| |
  
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| Spikemuth Gym |
|
Piers
| |
   
| |
| Hammerlocke Gym |
|
Raihan
| |
 
| |
Paldea League
Gym Leaders
| Cortondo Gym |
|
Katy
| |
  
| |
| Artazon Gym |
|
Brassius
| |
  
| |
| Levincia Gym |
|
Iono
| |
 
| |
| Cascarrafa Gym |
|
Kofu
| |
 
| |
| Medalia Gym |
|
Larry
| |
  
| |
| Montenevera Gym |
|
Ryme
| |
 
| |
| Alfornada Gym |
|
Tulip
| |
   
| |
| Glaseado Mountain Gym |
|
Grusha
| |
  
| |
Elite 4
| Elite 4 Member #1 |
|
Rika
| |
 
| |
| Elite 4 Member #2 |
|
Poppy
| |
  
| |
| Elite 4 Member #3 |
|
| Larry
| |
 
| |
| Elite 4 Member #4 |
|
Hassel
| |
 
| |
Champion
| Paldea Champion |
|
Geeta
| |
 
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