How can you do multi battles in the Pokemon League Sword/Shield?

Question

I'm pretty I saw in the Isle of Armour trailer a multi battle at the Wyndon Stadium.
It was Raihan and Leon on the same team.

Answer 1

Actually, you did see correctly. After completing the Crowned Tundra, once it's released, you can compete in the Galarian Star Tournament. In this, you battle with and against in game trainers. This is the only time though that Multi Battles are available in Wyndon. Also, Multi Battles are available with Hop at various points in the game.
Source: https://m.bulbapedia.bulbagarden.net/wiki/The_Crown_Tundra

Comments

Ok thanks a lot.

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You and Hop battle together to defeat Team Yell grunts during your stay at the motel near Motostoke gym. Also, You and hop battle Macros Cosmos people on your way up Rose Tower and against Sordward + Sheilbert.