>>32850233Its fundamental issue is that it's a bulky ice type with a rock type as well. Quad weak to fighting would make any wall virtually useless. Add a weakness to ground, water, and another quad weakness to steel, and auroras never really stood a chance. Fun to use in-game, but competitively it will never shine.
Oh yeah also its weak to stealth rock. Another nail in its coffin. Tyrantrum is great though.