Part 5: Beat Elesa — Nimbasa City Gym, badge 4

Beat Elesa — Nimbasa City Gym, badge 4 opens 4 areas.

Where to go

1. Driftveil City

   Wild: Frillish 100% · Lv 10-25, Alomomola 95% · Lv 10-30, Krabby 55% · Lv 35-55, Chinchou 40% · Lv 35-55 +4 more

2. Cold Storage

   Wild: Audino 90% · Lv 20-23, Herdier 35% · Lv 21-23, Vanillite 30% · Lv 20-23, Minccino 20% · Lv 20 +3 more

3. Driftveil Drawbridge

   Wild: Ducklett 100% · Lv 22-25

4. Route 5

   Wild: Audino 85% · Lv 19-22, Gothita 30% · Lv 19-22, Minccino 30% · Lv 19-22, Solosis 30% · Lv 19-22 +4 more

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.