Part 9: Beat the Elite Four and the Champion

Beat the Elite Four and the Champion opens 11 areas.

Where to go

1. Battle Resort

   Wild: Camerupt Lv 40, Sharpedo Lv 40

2. Desert Ruins

   Wild: Regirock Lv 40

3. Island Cave

   Wild: Regice Lv 40, Regigigas Lv 50

4. Ancient Tomb

   Wild: Registeel Lv 40

5. Sea Mauville

   Wild: Ho-Oh Lv 50, Lugia Lv 50, Spiritomb Lv 50

6. Scorched Slab

   Wild: Zubat 100% · Lv 14, Heatran Lv 50

7. Victory Road

   Wild: Zubat 60% · Lv 20, Aron 35% · Lv 20, Loudred 5% · Lv 20

8. Mirage Island

   Wild: Audino 90% · Lv 36-38, Graveler 85% · Lv 38, Darmanitan 60% · Lv 36-38, Munna 60% · Lv 36-38 +11 more

9. Mirage Forest

   Wild: Graveler 100% · Lv 36-38, Audino 90% · Lv 36-38, Forretress 60% · Lv 36-38, Kricketune 60% · Lv 36-38 +10 more

10. Mirage Cave

    Wild: Unown 100% · Lv 36-38, Graveler 85% · Lv 35-38, Klink 60% · Lv 36-38, Tynamo 60% · Lv 36-38 +6 more

11. Mirage Mountain

    Wild: Graveler 85% · Lv 35-38, Audino 60% · Lv 36-38, Darmanitan 60% · Lv 36-38, Xatu 60% · Lv 36-38 +15 more

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

It also doesn't say when 9 of its areas open up, so they are listed together in the last part rather than guessed into the story.