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Mixing some ideas from the post:
Third legendary is Tiangou (celestial dog chinese legendary beast).
This creature has two forms: LIGHT (Paradox Virizion) / DARKNESS (Paradox Suicune)
Scarlet Box picture it's actually Suicune (darkness form) eating the sun/moon.
Pic Related:
Red = Hexagon Crown, ruler of Paldea and ruins
Green = Tera Shards
Blue = Mane
Orange = Paws