>>32092608They are top tier, but I have just a few minor nitpicks with both.
My only real problem Solgaleo is the red markings on its legs. Those are unnecessary and just stand out. I'm not sure how I feel about the muscly look it has, but I don't hate that, at least. Not a fan of the paws either.
As for Lunala, I HATE the finger-like things it has jutting out of its wings. I get what they were going for when I see it in Full Moon phase, but normally, they bother me too much. Not a big fan of the face's shape either.
The other problems I have with both are more about their concept, rather than design. I dislike Solgaleo's Special Ability. I think it's boring. I dislike how Lunala is always suspended in midair.
Despite all this nitpicking, though, I still they're top tier designs. The third best, as far as box legends go, not counting Kanto starters. I'd rate them 8.7/10 for Solgaleo, 8.5/10 for Lunala.