As thanks for recovering the machinery, the manager rewards you with TM07 (Zap Cannon), a powerful but inaccurate move. With the region's power now running smoothly, it is possible to tie up some loose ends.
Upon reaching the cape, you find Misty on a date nearby. The guy gets scared off, and Misty starts to yell... until she spots your Johto Badges. She tells you to visit the Gym before heading back to town.
Bill's grandfather is housesitting while he is away, and really wants to see a certain species of Pokémon. Show him the correct Pokémon to be rewarded with one of the hard-to-find Evolution stones.
CERULEAN GYM POKéMON GYM LEADER: MISTY
The Tomboyish Mermaid
With her time off ruined, Misty has no choice but to return to the Cerulean Gym, which specializes in Water-type Pokémon. As the building features a large swimming pool, this is the only Gym where Pokémon can be hooked on a fishing rod. Grass- and Electric-type attacks will inflict heavy damage to these aquatic opponents, but avoid using Fire-, Ground-, and Rock-type Pokémon.
Defeated, Misty awards you the Cascade Badge to mark your victory.
The rolling hills of Route 5 make it easy to reach the former Pokémon Day Care building. The old woman inside gives out the Cleanse Tag, which decreases the chance of encountering wild Pokémon when held by your lead party member.