Pokémon Violet - Unrivaled Rillaboom 7-Star Crystal Raid Solo

With a Normal Tera Type Rillaboom being the 7 star raid battle, Corviknight is the perfect matchup against it since it seems Rillaboom spams Low Kick against it.
The main idea is you will Screech three times to lower its Defense. Once that happens, you can try using Iron Defense three times, but you will likely faint, so once you come back, make sure to do Iron Defense three times before you start to spam Body Press. For once, you don't want to Terastalize since it will likely stop using Low Kick once you do. Once its shield goes down, it'll reset its own stats, so do one last screech before you finish it off with some more Body Press attacks.
My Corviknight has 252 EVs in HP and Attack with an Adamant nature, where Attack wasn't really needed in this battle. I gave it a Shell Bell so it can restore whatever health it loses, and the main moves it needs are Screech, Iron Defense, and Body Press. Since I didn't use Roost at all, Power Trip might be good as a fourth slot.

[@SquittyStudios]

Wait how did you get 8 Ultra Balls (for ultra beasts) ?

[@ShadowMario3]

They along with the Apricorn balls are a possible reward in the Academy Ace Tournament.

[@SquittyStudios]

@@ShadowMario3 ah okay thank you