Part 6: Beat Winona — Fortree City Gym, badge 6

Beat Winona — Fortree City Gym, badge 6 opens 9 areas.

Where to go

1. Lilycove City

   Wild: Pikachu Lv 20

2. Mossdeep City

   Wild: Beldum Lv 1

3. Team Aqua Hideout

   Wild: Electrode Lv 40

4. Team Magma Hideout

   Wild: Electrode Lv 40

5. Route 120

   Wild: Oddish 60% · Lv 13, Marill 35% · Lv 13, Kecleon 5% · Lv 13

6. Safari Zone

   Wild: Doduo 60% · Lv 15, Oddish 35% · Lv 15, Psyduck 5% · Lv 15

7. Mt. Pyre

   Wild: Shuppet 100% · Lv 15, Meditite 35% · Lv 15, Vulpix 5% · Lv 15

8. Route 121

   Wild: Shuppet 60% · Lv 15, Wingull 35% · Lv 15, Kecleon 5% · Lv 15

9. Route 123

   Wild: Shuppet 60% · Lv 15, Wingull 35% · Lv 15, Kecleon 5% · Lv 15

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.