The Celadon Gym (Japanese: タマムシジム Tamamushi Gym) is the official gym of Celadon City. It is based on Grass-type Pokémon. The Gym Leader is Ari Brock. Trainers who defeat him receive the Rainbow Badge.
After defeating the npcs (The Twins), please move into the gym and and battle Ari.
As you approach the giant VileBlume shaped building two young sisters approach you. "Ari is the best!" They yell in unison. They pull two Pokéballs out of their bags...

User Image The Twins want to battle!

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Oddish Lvl. 15
+Stun Spore
+Bullet Seed
+Acid

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Bellsprout Lvl. 15
+Vine Whip
+Wrap
+Bullet Seed