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OK, let me just make one thing perfectly clear guys. I LOVE Accelgor; the typing, the design, the blistering speed and movepool adds up to a very unique and powerful Pokemon. Despite this, the poor ninja sits around the RU Tier alongside his counterpart, Escavalier. That doesn't necessarily mean Accelgor is bad, as his high speed can truly help against forces, while also setting up with moves like Spikes. If you want an interesting Pokemon that can set up fast and hit hard, why not try Accelgor for once?
Escargot
-Bug Buzz
-Giga Drain
-Spikes/Encore
-Hidden Power Rock
Item Attached: Choice Specs/Leftovers
Ability: Sticky Hold/Hydration
EV's/Nature:
252 Spe/252 SpA/4 HP
Timid Nature (+Spe, -Atk)
This set takes advantage of what makes Accelgor so great: His ability to set up, blistering speed and nice offensive stats combined with a good movepool.
Bug Buzz is your standard STAB Attack, with a nice 90 BP to deal with threats such as Whimsicott, Snover, Absol, Lilligant, and the two pixies of Uxie and Mespirit. Giga Drain is your other reliable move, as it provides decent coverage of Slowking, Sandslash, Rhydon, Quagsire, and heals Accelgor as he uses it. It also can take advantage of predictions, as your opponent could switch into something like Crawdaunt, only to have it dented by both coverage moves. Spikes is your standard set-up move, taking advantage of Accelgor's speed to set up quickly for as long as you can, while Encore is an easy stall bait move, as you can take advantage of a set up Pokemon like Uxie or other Accelgor. Finally, Hidden Power Rock is for flying types who could get in your Ninja bug's way, like Mandibuzz, Moltres, or for Fire Types in general like Typhlosion. The item you want all really depends on you. With Specs, you can work with that nice base 100 Sp. Atk, while Leftovers is for the types that like healing and not being locked into moves.
Other Options:
Yawn can be used as an alternative to Spikes or Encore, although it is not seen that often compared to the rest of Accelgor's moveset.
Focus Blast is there for alternative resistances like Cinccino and Aggron, although the 70% Accuracy does make it unreliable.
Acid Armor is a good support move, as it help increase Accelgor's pitiful 40 base defense to a moderate level.
Finally, Me First is quite an annoying move, as it can take advantage of any moves the opponent was going to use, whether supporting or offensive.
Counters and resistances:
While a base 100 Sp. Atk is nice, Accelgor doesn't have overwhelming power, so high Sp. Def Pokemon like Cryogonal can laugh at anything Accelgor throws at it with maybe Hidden Power Rock. Other special walls like Roselia, Drapion and Mandibuzz can easily wall the poor Ninja as well. Taunt users can also come in and halt all set-up Accelgor can do, but Accelgor's speed guarantee's at least one layer of spikes before it dies. Entei is also a great example of a check for Accelgor, as it can come in with a powerful Fire-Type move and absorb all other moves except Hidden Power Rock, or OHKoing it with a nice ExtremeSpeed. Status conditions are also Accelgor's worst nightmare, especially paralysis, as it halts all niche this set has, unless you have rain + Hydration going, which is nice. If your making an RU Team, be careful for this dangerous bug, as it's likely not leaving any time soon.