Right now I am mostly asking to myself: assuming that you dont need to shed one of your dual typing for better matchup against coverage, would there ever a reason where sametype tera would be better than stellar tera in raids?
I mentioned it in the main SV thread, but I think the Stellar type is actually a suboptimal pick in raids, despite it having infinite boosts specifically for them. This may be because Stellar doesn't really count as a type for STAB, so it never hits shields for the maximum rate when using moves with a matching tera type,
(For comparison, base game 6 stars have 20/35/75, Kitakami has 30/55/85, and Blueberry has 40/60/80, so Stellar has a closer showing in its home DLC.)
EDIT: Stellar Tera Blast does hit for the matching tera type rate. See post 54 below.
On the other hand, stellar still boosts off-type moves, matches the 2x tera STAB multiplier without shields, and at least hits for the tera multiplier instead of the non-tera multiplier, but it's a pretty noticeable drawback during the phase of the raid that you need raw damage to get through. I think it's still worth using for budget Arceus and Contrary mons, but it means Stellar is not as straightforward a pick as to invalidate regular tera types like most were expecting. I think it might be a new noob trap to watch out for on random mons, and also Terapagos may similarly be kind of meh. Personally this solidifies my decision to not build a Tera Stellar Azumarill.
Comparisons by mdash (Arceus vs Ghost Ninetales-Alola using SE Stellar Tera Blast, SE Stellar Dark Judgment, SE Tera Dark Judgment):
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