Part 7: Beat Tate & Liza — Mossdeep City Gym, badge 7

Beat Tate & Liza — Mossdeep City Gym, badge 7 opens 3 areas.

Where to go

1. Cave of Origin

   Wild: Zubat 100% · Lv 18, Groudon Lv 45, Kyogre Lv 45

2. Shoal Cave

   Wild: Zubat 63.2% · Lv 17, Spheal 60% · Lv 17, Snorunt 5% · Lv 17

3. Seafloor Cavern

   Wild: Zubat 100% · Lv 18

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

It also doesn't say when 9 of its areas open up, so they are listed together in the last part rather than guessed into the story.