Although there are multiple sites to reference for tiers, they may have slightly different tiers. Smogon is usually the one that everyone goes by when it comes to competitive battling. Also, in case you may not have known, not all legendaries are ubers either. Some Pokemon like Celebi, Jirachi, Phione, the birds and the dogs are not in the uber tier. So in summary, legendary does not always mean uber. I am not sure if there was a point in saying this but I figured I would throw it out there anyway. Hope that might have been at least somewhat helpful haha.