How can I access the Galarian Star tournament in Pokemon Shield?
Solution 1:
The requirements are:
- Complete the Isle of Armor story. This is done after winning the last battle against Mustard. This can only be done after completing the non-DLC post-game story (stopping Sordward and Shielbert).
- Start the "They Came From The Ultra Beyond!" quest (the Ultra Wormhole quest) by talking to Peony in the Max Lair.
You had mentioned that you had completed much of the Isle of Armor in Shield, but you need to complete all of the Isle of Armor story.