How did Mega Audino get from NU in gen VI to OU to gen VII
Each successive tier is calculated off of the higher tier as follows. Tiers are recalculated every three months using weighted usage statistics.
Because OU is the highest usage-based tier and audinite hasn't been released for three months, it hasn't had the chance to drop to lower tiers. source
I just think it's there because it was recently released. There's no usage stats for it yet so it has to stay in OU by default. Once there are usage stats for it, expect to see it move.
EDIT: dangit sniped...
