Delphox 7-Star Raids this weekend
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Pokemon Scarlet and Violet Delphox 7-star Tera Raid: All moves, drops, counters, and more
https://www.sportskeeda.com/pokemon/pokemon-scarlet-violet-delphox-7-star-tera-raid-all-moves-drops-counters
The first phase of the Delphox 7-star Tera Raid Battle event is now online. Pokemon Scarlet and Violet trainers around the world can encounter the Fox Pokemon in unique black crystal Tera Raids.
Modest Heatran worked well for me.