Dream World UU
--like PU--is not an official Smogon tier. However, it's easy enough to come up with a banlist for it based on Dream World OU usage stats.
Note that while there is no Dream World UU ladder, you will be able to challenge people directly to DWUU battles on Pokemon Showdown, once the Dream World tiers are added.
Differences from last time:
Newly DW OU
Formerly DW OU