Part 4: Beat Valerie — Laverre City Gym, badge 6

Beat Valerie — Laverre City Gym, badge 6 opens 5 areas.

Where to go

1. Laverre City

   Wild: Poliwag 100% · Lv 15, Basculin 65% · Lv 25, Poliwhirl 65% · Lv 35

2. Route 15

   Wild: Poliwag 100% · Lv 15, Lombre 66% · Lv 34-36, Basculin 65% · Lv 25, Poliwhirl 65% · Lv 35 +9 more

3. Route 16

   Wild: Poliwag 100% · Lv 15, Lombre 66% · Lv 34-36, Basculin 65% · Lv 25, Poliwhirl 65% · Lv 35 +10 more

4. Route 17

   Wild: Delibird 40% · Lv 38-40, Snover 30% · Lv 38-39, Sneasel 29% · Lv 38-40, Abomasnow 1% · Lv 40

5. Frost Cavern

   Wild: Poliwag 100% · Lv 20, Poliwhirl 66% · Lv 38-40, Basculin 65% · Lv 30, Vanillite 60% · Lv 20 +9 more

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

It also doesn't say when Kalos Berry Fields opens up, so it is in no part above; it has its own route page.