Part 6: Beat Clay — Driftveil City Gym, badge 5

Surf (HM03)

Beat Clay — Driftveil City Gym, badge 5 opens 4 areas.

Where to go

1. Chargestone Cave

   Wild: Drilbur 100% · Lv 24-27, Joltik 39% · Lv 24-27, Klink 29% · Lv 25-27, Ferroseed 20% · Lv 24-25 +2 more

2. Route 6

   Wild: Basculin 100% · Lv 10-25, Audino 75% · Lv 22-25, Poliwhirl 55% · Lv 35-70, Poliwag 45% · Lv 35-55 +10 more

3. Route 7

   Wild: Audino 90% · Lv 26-29, Cubchoo 30% · Lv 26-28, Tranquill 30% · Lv 26-28, Deerling 20% · Lv 26 +5 more

4. Celestial Tower

   Wild: Litwick 100% · Lv 26-29, Elgyem 50% · Lv 26-29

Everything you can have caught by this checkpoint · Open the interactive guide

It also doesn't say when 4 of its areas open up, so they are listed together in the last part rather than guessed into the story.