In past generations, Dugtrio was a terrible option in Ubers because, while its ability allowed it to trap opposing Pokemon, it was too weak to pose any kind of threat. However, with the advent of Black and White, Dugtrio was sent a gift from heaven in the form of Hone Claws. Now Dugtrio can take advantage of Choice-locked Electric-type attacks by setting up on them. Ignore Dugtrio as a threat by carelessly using attacks and it will make you pay.
The goal of this set is take advantage of the numerous Electric-type attacks used by grounded Choice-locked Pokemon. When Dugtrio has safely switched in, it can set up a Substitute and use Hone Claws to raise its Attack to extraordinary heights while the opposing Pokemon has no choice to but to repeat its futile struggle. When Dugtrio is fully set up, it will have a monstrous 1036 Attack and can then proceed to sweep the opponent's team. Earthquake is Dugtrio's main STAB, and Stone Edge has excellent coverage alongside it. Stone Edge's accuracy will not be an issue after the use of Hone Claws either. At +6 Attack, Dugtrio can OHKO standard Lugia with Stone Edge. Sucker Punch can be used as the coverage move to get the jump on Giratina-O using Shadow Sneak or Mewtwo. Be aware that Sucker Punch will not go before ExtremeSpeed because ExtremeSpeed now has a higher priority than Sucker Punch.Team Options & Additional Comments >>>
Dugtrio can don the classic Choice Band or Life Orb for a trapping set that specializes in removing Ground-weak Pokemon, such as Dialga, Reshiram, and Zekrom, but is generally too weak to be much use elsewhere in Ubers. Even with a Choice Band or Life Orb, Dugtrio will have trouble removing more defensively oriented Dialga or Flame Charge Reshiram. One can forgo Substitute on the Hone Claws set for Sucker Punch, but Dugtrio likes to hide behind its Substitute.
Dugtrio has a handful of other moves it can use. Night Slash can be used to hit Giratina-O for super effective damage. Reversal can be combined with Substitute for a 200 Base Power attack, but is generally unreliable. It is also interesting to note that Dugtrio is now the fastest user of Memento, which can be combined with Dugtrio's trapping abilities to create conditions for a teammate to setup.
Checks and Counters
Strictly speaking, once Dugtrio has trapped its prey, it is uncounterable because the opponent cannot switch. That aside, physically defensive Pokemon, especially those that resist Earthquake, are generally the best Pokemon to defeat Dugtrio after it has removed the Choice Pokemon locked into an Electric-type attack. Groudon and Giratina can take a +6 Earthquake and Roar Dugtrio away, while Skarmory and Giratina-O can take a +6 Stone Edge and Whirlwind it away or pick it off with Shadow Sneak, respectively. Excadrill in sandstorm holding a Balloon and the rare Claydol can defeat Dugtrio should it lack Sucker Punch. Otherwise, Dugtrio requires two hits to take out, one to break its Substitute and the other to KO it. Without its Substitute, Dugtrio can easily be picked off by Pokemon who are faster than it or with priority. Mewtwo, Darkrai, Shaymin-S, Arceus, and Rayquaza are great examples of this.
Of course, the best way to counter Dugtrio is via smart play. If the opponent's Dugtrio is revealed by Team Preview, avoid locking Choice Scarf Palkia or Zekrom into Thunder or Bolt Strike respectively until you are sure that the coast is clear.