Gym Leaders:
Pewter City:
| Gym Leader: | Brock |
| Pokemon: | Geodude LV: 12 & Onix LV: 14 |
| Prizes: | Boulder Badge & TM 34 (Bide) |
Cerulean City:
| Gym Leader: | Misty |
| Pokemon: | Staryu Lv: 18 & Starmie Lv: 21 |
| Prizes: | Cascade Badge & TM 11 (Bubblebeam) |
Vermilion City:
| Gym Leader: | Lt. Surge |
| Pokemon: | Voltorb Lv: 21, Pikachu Lv: 18, & Raichu Lv: 24 |
| Prizes: | Thunder Badge & TM 24 (Thunderbolt) |
Celadon City:
| Gym Leader: | Erika |
| Pokemon: | Victreebell Lv: 29, Tangela Lv: 24, & Vileplume Lv: 29 |
| Prizes: | Rainbow Badge and TM 21 Mega Drain |
Saffron City:
| Gym Leader: | Sabrina |
| Pokemon: | Kadabra Lv: 38, Mr. Mime Lv: 37, Venomoth Lv: 38, & Alakazam Lv: 43 |
| Prizes: | Marsh Badge & TM 46 (PsyWave) |
Fushia City:
| Gym Leader: | Koga |
| Pokemon: | Koffing Lv: 37, Muk Lv: 39, Koffing Lv: 37, & Weezing Lv: 43 |
| Prizes: | Soul Badge and TM 6 (Toxic) |
Cinnabar Island:
| Gym Leader: | Blaine |
| Pokemon: | Growlithe Lv: 42, Ponyta Lv: 40, Rapidash Lv: 42, & Arcanine Lv: 47 |
| Prizes: | Volcano Badge and TM 38 (Fire Blast) |
Viridian City:
| Gym Leader: | Giovanni |
| Pokemon: | Rhyhorn Lv: 45, Dugtrio Lv: 42, Nidoqueen Lv: 43, Nidoking Lv: 45, & Rhydon Lv: 50 |
| Prizes: | Thunder Badge & TM 24 (Thunderbolt) |