Part 1: Just started — no badges

Just started — no badges opens 4 areas.

Where to go

1. Route 2

   Wild: Bunnelby 20% · Lv 2-3, Fletchling 20% · Lv 2-3, Scatterbug 20% · Lv 2-3, Zigzagoon 15% · Lv 3-4 +3 more

2. Route 3

   Wild: Magikarp 100% · Lv 15, Masquerain 66% · Lv 25-27, Goldeen 65% · Lv 25, Gyarados 60% · Lv 35 +12 more

3. Santalune Forest

   Wild: Caterpie 20% · Lv 2-3, Scatterbug 20% · Lv 2-3, Weedle 20% · Lv 2-3, Fletchling 10% · Lv 4 +6 more

4. Aquacorde Town

   Wild: Chespin Lv 5, Fennekin Lv 5, Froakie Lv 5

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.