Before you can enter the Fuchsia Gym, you must have captured at least 50 different species of Pokemon. If you’ve been capturing and evolving Pokemon along the way, you should have reached the target.
The Fuchsia City Pokemon Gym specializes in poison-type Pokemon. This type is weak against ground- and psychic-type attacks. Do not use grass- or fairy-type Pokemon or else the poison-type attacks will deal massive damage.
There are six trainers and the gym leader standing out in the open. A set of invisible walls will be blocking your path directly to the gym leader. These walls can only be seen when the mist floods the gym. To reach the leader, you must walk around the perimeter along the eastern and northern sides of the room. Head to the east side of the room and challenge the Pokemon Trainer here.
Koga is the leader of the Fuchsia City Gym. He specializes in poison-type Pokemon, and his technical machine of choice is a poison status condition called Toxic. Toxic will increase the damage done on a Pokemon each turn it is in battle. Even the strongest Pokemon with the highest HP will fall to this move after several turns. Of course, this can be countered by using a Full Heal or Antidote.
If you’re having trouble, remember to use ground-type and psychic-type attacks to deal massive damage. The best option for weaker teams is to use psychic-type special attacks against Weezing and Golbat, then use ground-type physical attacks against Muk and Venomoth. Another option is to sweep the team with the strongest Pokemon you have.
Defeat Koga to receive P7,040, TM27 Toxic, and the Soul Badge which means Pokemon up to level 70 will obey your commands in battle, including those received from trades.