Although it has suffered in UU, Shiftry finds a unique niche for itself in Ubers. Its access to Nasty Plot, Swords Dance, STAB on both Grass-type and Dark-type moves, and blistering Speed in the sun make it a good choice on Drought-abusing teams. However, Shiftry is quite literally a fair-weather friend: if rain, sandstorm, or a Pokemon with Air Lock is on the field, expect a speedy demise for Shiftry. Even in the sun, Shiftry can be countered and walled, so do not overestimate what you can do with it. Nonetheless, if you give Shiftry the support it needs, you will be pleasantly surprised at what the Chlorophyll abuser can do.
At first glance, using Shiftry in Ubers seems to be a foolish endeavor. However, very few Ubers learn Nasty Plot, and in the sun, Shiftry is able to reach 518 Speed with a neutral nature, easily outpacing threats such as Choice Scarf Garchomp, Rock Polish Groudon, and even Deoxys-S, and OHKOing each aforementioned Pokemon with the proper move.
Dark Pulse is an excellent move to use against Pokemon such as Giratina-O, Giratina, Latias, and other Psychic-types, OHKOing all of them after a Nasty Plot. However, if you know your opponent is packing a Kyogre, you may wish to use Grass Knot first for a surprise attack, as Kyogre, who summons rain, outspeeds Shiftry outside of the sun and can end its sweep if it uses Nasty Plot. With a Life Orb, Shiftry OHKOes a 252/0 Kyogre 46.15% of the time with Stealth Rock damage (a guaranteed OHKO on any other variant). If a defensive Kyogre is not OHKOed, Shiftry can strike again with a Grass Knot, as it outpaces such a Kyogre. It's worth noting that SolarBeam is not recommended, because Grass Knot hits most Ubers for the same Base Power anyway, and if Shiftry gets stuck charging against an incoming Kyogre or Rayquaza, you will lose Shiftry.Team Options & Additional Comments >>>
While Shiftry primarily runs a special set, it also has access to Swords Dance to hit hard from the physical side. This set plays fairly similarly to the Nasty Plot variant, though it handles Blissey and Dialga better at the cost of overall power and a worse match-up against Giratina and Rayquaza.
Shiftry's options for STAB attacks aren't stellar, but they get the job done. After a Swords Dance, Seed Bomb OHKOes Groudon, Palkia, Blissey, and Kyogre (among others). Speaking of Kyogre, this set's strategy of dealing with it is similar to that of the Nasty Plot: use Seed Bomb on the first turn. Offensive Kyogres are OHKOed, while defensive sets are outsped and 2HKOed. Your other main attack is Faint Attack, which, after a Swords Dance, OHKOes Lugia, Mewtwo, Latias, Wobbuffet, and Giratina-O. Unfortunately, it only 2HKOes Giratina, who can use Will-O-Wisp and stall Shiftry out. Finally, Low Kick is your best option against Dialga, Heatran, and Darkrai, all of whom are OHKOed after one turn of setup. Explosion is usable alongside Sucker Punch simply due to the power, but note that it hits many of the same targets as Faint Attack, so using both is redundant.Team Options & Additional Comments >>>
Unless you are running a mixed set, there's little reason to deviate from the standard EVs. Using a positive Speed nature will let you outpace Scarfed Shaymin-S and Gengar in the sun, but they are rare enough to make the point almost moot.
There are not many other moves that wouldn't be considered rather situational. Focus Blast is viable to score an OHKO on Dialga after a Nasty Plot, but the accuracy can be disappointing, and Shiftry will often find that it cannot afford to miss. Hidden Power Fire can OHKO Scizor, Forretress, and the rare Skarmory, but has very little use outside of that. A SubSeed set is theoretically viable, but Jumpluff is a superior choice for this role because of its access to Encore and Sleep Powder.
Checks and Counters
Countering Shiftry in the sun is surprisingly difficult. If you have to defeat Shiftry in its favored weather, Scizor and Dialga make great choices, as they both laugh at Shiftry's attacks and OHKO in return. Blissey walls the Nasty Plot set, while Giratina defeats the Swords Dance one, but be wary of switching into the wrong set. If you can remove the sun, Shiftry becomes a sitting duck, and Kyogre and Rayquaza can both revenge kill Shiftry fairly easily.