Noivern's max speed Modest = 345
Carracosta's max speed (Ability ups speed) = 179 x 2 = 358
Carracosta's max speed (Adamant) = 163 x 2 = 326
Carracosta outspeeds your Noivern if Carracosta has 252 Speed and a Jolly Nature but it won't if it's Adamant.
Also Sticky Web has in? It drops speed by 0.67x.
Lagging Tail or Iron Ball holded by Noivern?
Carracosta with Quick Claw?
Battle Spots rules don't influences stats boosts or drops.
The only option has Carracosta had Jolly Nature or with the items above.
Hope this helps to your question.