Part 1: Just started — no trials

Just started — no trials opens 2 areas.

Where to go

1. Route 1

   Wild: Finneon 40% · Lv 15-18, Happiny 40% · Lv 10-13, Tentacool 40% · Lv 15-18, Caterpie 33.3% · Lv 3-5 +18 more

2. Route 2

   Wild: Crabrawler 100% · Lv 7-10, Rattata (Alola) 41.2% · Lv 9-10, Yungoos 41.2% · Lv 9-10, Spearow 36.4% · Lv 7-10 +9 more

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

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