This may be, too late.I have Thornadus,but wheres Thundurus?I sometimes come to where it's thundering,but Thundurus is not appearing?!Where is it?!
You can only get Tornadus in Black, Thunderus is only in White. You have to trade with someone to get it.
You can't.thundrus is only available in Pokemon white version. You would have to trade.