Part 1: Just started — no badges

Just started — no badges opens 5 areas.

Where to go

1. Striaton City

   Wild: Basculin 100% · Lv 5-15, Goldeen 60% · Lv 35-55, Seaking 20% · Lv 35-70

2. Dreamyard

   Wild: Audino 95% · Lv 8-11, Patrat 40% · Lv 8-11, Purrloin 40% · Lv 8-11, Kricketune 35% · Lv 47-50 +11 more

3. Route 1

   Wild: Audino 100% · Lv 2-4, Basculin 100% · Lv 5-15, Lillipup 50% · Lv 2-4, Patrat 50% · Lv 2-4 +5 more

4. Route 2

   Wild: Audino 100% · Lv 4-7, Lillipup 40% · Lv 4-7, Patrat 40% · Lv 4-7, Purrloin 20% · Lv 4-5

5. Nuvema Town

   Wild: Oshawott Lv 5, Snivy Lv 5, Tepig Lv 5

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.