Damn I was going to make a thread on this lol, but I don't know where all of you guys are finding tm/hm, new ability/move descriptions.
I like this guy he's somewhat like Jumpluff with a plus, but no Sleep Powder. On the other hand Mischievous Heart does give it some pretty amazing utility (if the description holds true) I think.
I mean think about it, if it means all non-attacking moves, (or just some select ones), thanks to it's already extremely fast base stat it could be one of the best "utility" Pokemon (not sure of the term). It being the fastest Mischievous Heart Pokemon with only 2 (Legend flying(/electric) Pokemon) 111 base Speed and Leperasudu who is 106 base speed, behind it, while Erufuun rests at a nice 116 base speed, means it will almost surely go first with non attacking moves all the time.
So say you are about to be swept by a Stat Upped Pokemon (+2, +2 Kingdra?), you can just cripple it with Erufuun using Stun Spore, Encore, Memento, GrassWhistle (risky but eh), Cotton Spore, or some hampering item (Iron Ball?) with Switcheroo. And if this generation turns out to be as weather oriented as it is looking, Erufuun using a Priority Sunny Day can be the difference between getting swept by a team of Sand/Rain sweepers or you sweeping them. And if Mischievous Heart cancels out Trick Rooms negative priority or they nerfed it or something this generation, it can utilize that as well. It will also always be able to stop set up (leads) no matter what (assuming the mechanics haven't changed or something), Ultimate Anti-Lead anyone :)?
Taunt, Tailwind, Helping Hand are obviously good options as well, maybe very useful in Doubles/Triples as well, though I don't know much about that.
Sleep Powder would have made this thing beastly, but I think it still has a lot more potential than just a leech seed set, which does seem a little forced, but at least it has Mischievous Heart to set itself apart from other Leech Seeders (despite it being walled by Grass-Types).
edit:
Example Sets:
Anti-Fuun
Erufuun @ Leftovers
Ability: Mischevious Heart
EVs: 240 HP / 128 Def / 136 SpD / 4 Spe
Calm nature (+SpD, -Atk)
- Taunt
- Stun Spore / Encore
- Leech Seed
- Substitute / Encore / U-Turn / Sunny Day
Stop you from getting swept I suppose? Doesn't seem like you'd need speed evs unless your paranoid about being outsped by Leperasudu or the two Flying(/Electric) Legends (last two seem like they might go to Ubers soon, but no theorymonning from me!). 321 max HP gives a Leech Seed number + 1 for max amount of Subs in order to destroy your opponent.
or with basically the same set
Toxic/Seed Killer
Erufuun @ Leftovers
Ability: Mischevious Heart
EVs: 240 HP / 128 Def / 136 SpD / 4 Spe
Calm nature (+SpD, -Atk)
- Taunt / Encore
- Toxic / Encore
- Leech Seed / Encore
- Substitute
Encore somewhere maybe! Use your all priority moveset to slowly (but actually not that slow) to completely Leech Seed / Toxic your opponent to death. 321 max HP gives a Leech Seed number + 1 for max amount of Subs in order to destroy your opponent. Maybe not as effective as I'm hoping for, but looks like it might be good for one kill or at least destroy stall, aid other pokes with Leech Seed or Toxicing a troublesome opponent, and most likely very easily punish a stat upper with Encore. Encore will always be faster thanks to Mischievous Heart (we're assuming by the description), so if you switch in Erufuun on a Dragon Dance from Salamence or whoever, they'll always be Encore'd (assuming no other mechanics other than normal are at work), which means you can then proceed to Leech Seed / Toxic Sub Stall. Always walled by pretty much all Grass/Poison Types, or Steels and Poisons if you only go with Toxic, and Grasses if you only go with Leech Seed.