i guess this is for PO, where you Do Not have to catch Pokemon.......
by the way, Uber is a tier for very,very strong pokemon, like Legendaries i.e. Mewtwo, Zekrom, etc.
Also, Uber pokemon are Not allowed in lower tiers, like OU(over-used),UU(under-used), NU(never-used) and definitely not LC(little-cup) .