Celadon City Gym
Description Of Celadon Gym:
As you investigate the big city of Celadon, you're bound to discover the Celadon Gym and the peeper looking in. The Celadon Gym is home to Leader Erika, a Grass-Type Pokemon User. You will need to still have a Pokemon that knows cut to get to Erika though.
There are a number of additional trainers in her Pokemon Gym:
Lass - Level 23 Bellsprout & Level 23 Weepinbell
Beauty - Level 21 Bellsprout, Level 21 Oddish, Level 21 Bellsprout & Level 21 Oddish
Jr. Trainer - Level 24 Bulbasaur & Level 24 Ivysaur
Beauty - Level 21 Bellsprout
Cooltrainer - Level 24 Ivysaur, Level 24 Gloom & Level 24 Weepinbell
Lass - Levvel 23 Oddish & level 23 Gloom
Beauty - Level 26 Exeggcute
After getting to the north-center of the gym through the cuttable trees, you will find and battle Erika. Like all the trainers in the gym, one Fire-Type Move or Pokemon can easily defeat her. If not Fire, then definitely go with Flying-Type Moves.
Erika's Pokemon: Level 24 Tangela, Level 29 Victreebel & Level 29 Vileplume
After you defeat Erika, you'll receive the Rainbow Badge and TM21 (Mega Drain). You will also be allowed to use HM04 (Strength) outside of battle.