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No matter how strong you think your Pokémon are, before you can even consider joining a seven-star Tera Raid, you’ll first have to unlock both five-star and six-star raids.
Five-star raids are unlocked by completing the Academy Ace Tournament (after becoming Champion of the Paldea region), and then you can access six-star Tera Raids once you’ve won 10 at the five-star level.
Source: https://www.distractify.com/p/how-to-get-seven-star-raids-pokemon-scarlet-violet
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