Gyms are Pokémon-trainer facilities that have been officialized by the Pokémon League to certify challengers with badges—accolades that qualify a player's eligibility for the aforementioned league. The officials that preside over the gyms are referred to as gym-leaders.
Eight gyms are stationed in each of the four mainland regions (Kanto, Johto, Hoenn and Sinnoh); badges must be culled from each one of them in order to qualify for the regional Pokémon-league tournament. Because your access is localized to the environs of the gym city until you obtain its rewarded badge, every gym must be defeated in order for your regional travel and the compulsory storyline to be progressible.
Gym-leaders are not rechallengable after you have defeated them; they are only rechallengable upon losing to them, and all subsequent battles will void off any experience-points and Pokémoney payouts that would have been reaped from winning, otherwise. However, the peripheral trainers of the gym can be continually rechallenged after a one-week cooldown.
Leaders
Kanto
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 | Brock | |
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 | Misty | |
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 | Lt. Surge | |
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 | Erika | |
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 | Janine | |
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 | Sabrina | |
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 | Blaine | |
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 | Giovanni | |
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Johto
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 | Falkner | |
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 | Bugsy | |
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 | Whitney | |
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 | Morty | |
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 | Chuck | |
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 | Jasmine | |
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 | Pryce | |
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 | Claire | |
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Hoenn
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 | Roxanne | |
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 | Brawly | |
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 | Wattson | |
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 | Flannery | |
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 | Norman | |
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 | Winona | |
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 | Tate and Liza | |
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 | Juan | |
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 | Wallace | |
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Sinnoh
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 | Roark | |
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 | Gardenia | |
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 | Maylene | |
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 | Wake | |
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 | Fantina | |
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 | Byron | |
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 | Candice | |
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 | Volkner | |
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Move-technique rewards
As a supplementary reward to the gym's badge, most gym-greeters will also give a permanent congratulatory reward to the victorious trainer by imparting move techniques—a TM or move-tutorship access for a move of a type that tallies to the gym's specialistic type. The TM-selling gym-greeters will also offer cumulative-discount bundles of 5 TMs that cost as much as it would require to pay the single-purchase price of the TM four times, effectively discounting the price for 1 of the 5 TMs.
Kanto
| Gym |
Impartation |
Move |
Prices |
| First purchase | Standard | Five |
| Pewter City | TM34 | Bide | 375 | 750 | 3,000 |
| Cerulean City | TM11 | Bubble Beam | 750 | 1,500 | 6,000 |
| Vermilion City | TM24 | Thunderbolt | 1,500 | 3,000 | 12,000 |
| Celadon City | TM21 | Mega Drain | 750 | 1,500 | 6,000 |
| Fuchsia City | TM06 | Toxic | 1,000 | 2,000 | 8,000 |
| Saffron City | TM29 | Psychic | 1,500 | 3,000 | 12,000 |
| Cinnabar Island | TM85 | Flamethrower | 1,500 | 3,000 | 12,000 |
| Viridian City | TM26 | Earthquake | 3,000 | 6,000 | 24,000 |
Johto
| Gym |
Impartation |
Move |
Prices |
| First purchase | Standard | Five |
| Violet City | Tutor | Tailwind | N/A | 15,000 | N/A |
| Azalea Town | TMError: no local variable "tm" has been set. | U-Turn | 1,250 | 2,500 | 10,000 |
| Goldenrod City | Tutor | Covet | N/A | 10,000 | N/A |
| Ecruteak City | Tutor | Ominous Wind | N/A | 10,000 | N/A |
| Cianwood City | Tutor | Drain Punch | N/A | 10,000 | N/A |
| Olivine City | Tutor | Iron Head | N/A | 10,000 | N/A |
| Mahogany Town | TM13 | Ice Beam | 2,000 | 4,000 | 16,000 |
| Blackthorn City | Tutor | Dragon Pulse | N/A | 10,000 | N/A |
Hoenn
| Gym |
Impartation |
Move |
Prices |
| First purchase | Standard | Five |
| Rustboro City | TM89 | Rock Tomb | 1,500 | 3,000 | 12,000 |
| Dewford Town | TM58 | Bulk Up | 1,250 | 2,500 | 10,000 |
| Mauville City | TM24 | Thunderbolt | 1,500 | 3,000 | 12,000 |
| Lavaridge Town | TM100 | Overheat | 3,500 | 7,000 | 28,000 |
| Petalburg City | TM92 | Facade | 1,750 | 3,500 | 14,000 |
| Mossdeep City | TM54 | Calm Mind | 1,000 | 2,000 | 8,000 |
Sinnoh
Gym layouts
Kanto
| Kanto Gyms |
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| Pewter Gym | Cerulean Gym | Vermilion Gym | Celadon Gym |
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| Fuchsia Gym | Saffron Gym | Cinnabar Gym | Viridian Gym |
Johto
| Johto Gyms |
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| Violet Gym | Azalea Gym | Goldenrod Gym | Ecruteak Gym |
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| Cianwood Gym | Olivine Gym | Mahogany Gym | Blackthorn Gym |
Hoenn
| Hoenn Gyms |
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| Rustboro Gym | Dewford Gym | Mauville Gym | Lavaridge Gym |
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| Petalburg Gym | Fortree Gym | Mossdeep Gym | Sootopolis Gym |
Sinnoh
| Sinnoh Gyms |
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| Oreburgh Gym | Eterna Gym | Veilstone Gym | Pastoria Gym |
| File:Hearthome Gym.png |  |  |  |
| Hearthome Gym | Canalave Gym | Snowpoint Gym | Sunyshore Gym |