Question

How to refresh the Tera Raids on your map?

Answer 1

This already has an answer but I wanted to share a faster method.

For this, you'll need to turn off Synchronize Clock via Internet.

• With Scarlet/Violet open, press the Home button. Don't close out of the game.
• Go to System Settings.
• Scroll down to System at the bottom.
• Go to Date and Time.
• Press Date and Time (the one in Date and Time).
• Press OK (that's right, just OK. No need to change the time or anything).
• Go back to the Home menu and go back into the game.

After doing all this, your outbreaks and Tera Raids should change. If for some reason it doesn't work, repeat the process again. Once you have the method down, resets take about 10 seconds.

And of course, your Tera Raids (and outbreaks) reset as midnight passes.

Source: Experience.

Hope this helped!

Answer 2

Pokemon Scarlet & Violet’s Tera Raid den locations and Mass Outbreaks reset at midnight local time.

• Close out of Pokemon Scarlet & Violet
• Navigate to your Switch’s settings
• Scroll down to ‘System’ and select ‘Date and Time’
• Turn off Synchronize Clock via Internet
• Change time to 11:55-11:58 PM. Note: Do not change the date.
• Launch Pokemon Scarlet & Violet
• Wait for time to manually tick over to midnight

Your Tera Raids will reset as midnight passes

Source

I hope this is what you're asking for!