Ryan's PokAnalysis
If only Dunsparce didn't have Thunder Wave. IF ONLY...but since it does, it can abuse its Ability Serene Grace to make opponents flinch until they die. Aside from that, its stats suck. At least it gets Coil to make its bad stats and equally bad move pool look somewhat impressive. If you want to use Dunsparce in Standard, spare yourself the embarrassment and don't, as you have far better choices, specifically Jirachi and Togekiss...but in Neverused Dunsparce is the ultimate troll.
Abilities
Serene Grace: Doubles the likelihood of added effects happening. This is the reason why Dunsparce is such a troll. It causes so much flinching that it's hilarious.
Run Away: improves your chances of getting away in the wild. Absolutely useless competitively speaking.
Rattled: Bug-, Ghost- and Dark-type moves raise its Speed. Useless, though not as much so as Run Away. I guess if you REALLY wanted to sweep with Dunsparce, this would be how you'd do it...
Moveset time.
Derp Spice: The Original
- Headbutt / Rock Slide
- Thunder Wave / Glare
- Coil
- Roost
Item Attached: Leftovers
Ability: Serene Grace
EVs and Nature:
144 HP / 252 Atk / 112 SDef
Adamant Nature (+Atk, -SAtk)
If you see Dunsparce, prepare to get flinched to death. Paralyze first, ask questions later. Then you can go to town, flinching the opponent to death. Headbutt gets STAB but nothing is immune to Rock Slide. Coil further improves your capability of getting this job done, and Roost keeps you healthy. Flying snakes? That make sense to you? Yeah, me neither.
Other Options
Aqua Tail, Body Slam, Calm Mind, Curse, Earthquake, Gyro Ball, Magic Coat, Pursuit, its Special moves, Yawn, King's Rock.
Aqua Tail can wipe Golurk off the map but isn't very useful otherwise.
Body Slam's chance of paralysis shoots to 60% with Serene Grace, making it an offensive replacement for thunder Wave or Glare.
Calm Mind allows Dunsparce to switch things up, using its better Defense to snag a boost for its special move pool.
Curse is useful, but...you have Coil...don't use unless you're using Gyro Ball.
Earthquake doesn't have an added effect to use, but it takes down Steels, which is useful.
Gyro Ball isn't that good barring under Trick Room conditions. It does, however, hit hard with Curse.
Magic Coat stops fools who try to use Dunsparce as set-up fodder for Rocks and Spikes.
Pursuit slaps other fools who try to run from Dunsparce's paraflinching death trap.
Dunsparce has in my opinion one of the best special move pools in NU. If you wanna go that route, pack Calm Mind.
Yawn I guess could go on a set with Pursuit / Coil / something else. Its job would mainly be to phase enemies immune to Thunder Wave.
King's Rock gives you the option to forego leftovers recovery to up your flinch chance.
Double and Triple Battle Options
Under Trick Room conditions, Dunsparce can be a huge headache. Rock Slide causes excessive flinching and can help your TR sweeper step in and eliminate the helpless enemies. But that's all I can think of it doing. Outside of Trick Room, it might be able to throw some status around, assuming it survives. With 404 HP, it can survive a solid hit, take a couple spread moves. But you should just keep to Trick Room, where causing flinching over and over again with Rock Slide is what it does best.
Partners
Although not necessary, Trick Room allows Dunsparce to skip the paralysis altogether and start mayhem immediately. In that case, Beheeyem and Misdreavus help cover off weaknesses and give Dunsparce a few turns of Trick Room to be a totally nasty snake. You can also have paralyzing partners which again let Dunsparce get straight to work, boosting up with Coil while the opponent eagerly awaits the serpentine judgment that is to be dealt to it.
Counters
Golurk. Golurk is a huge one, as somewhere between all of those flinches, it will pummel Dunsparce, being immune to Headbutt and resisting Rock Slide. Other than the ghost giant, anything that can take a round of paralysis and hit back hard enough can do the trick. For me, Rampardos comes to mind, even though it's more of a check. Alomomola can take its Headbutts and find somewhere in between flinches to use Toxic on Dunsparce - then it's really screwed. Ferroseed can take anything it can throw at it, not fearing paralysis, and sap away its health. Dunsparce is also revenge killed more easily than it should be, due to its Special Defense. Focus on that, and Dunsparce will be surprisingly easy to take down.