It can counter both Burunkeru and Nattorei at the same time, which is great for any Pokemon.
Do you judge that it needs focus miss to do this? Or can one feasibly calm mind up against Nattorei and knock it dead with psycho shock and thunder? I mean, I'm currently thinking "FOURMOVESLOTSYNDROMEFOURMOVESLOTSYNDROMEFOURMOVESLOTSYNDROMEFOURMOVESLOTSYNDROME" in my mind, due to wanting to be able to clean the clocks of both Nattorei and Tyranitar with focus blast, Blissey with psycho shock, and Burunkeru and bulky waters not named Swampert with thunder. If it was thunderbolt instead of thunder, I wouldn't hesitate...
I don't want to miss out on stab, and yet I don't want to be unable to actually break stall, which is the whole point of using Ranku, IMO. What is your experience regarding this on PO? Or anyone else's opinion on wifi, or whatever simulator?
Also, with regeneration (which we're technically not supposed to discuss yet, due to it being a dream world ability) this can be an excellent paralyzer. Teams with Togekiss that want Togekiss to have both roost
and nasty plot can use this to paralyze the opponent's team. It's slow, so it can make good use of thunderwave itself, it can beat most natural cure pokemon (although beating Blissey probably requires a stallbreaking set, with magic guard), and it's bulky and has regeneration, so it can come in again and again to paralyze more of the opponent's team. I'm picturing this:
Rankurusu @aiming mark
Ability: regeneration
EVs: 252 HP / 120 Def / 76 SAt / 56 Sdf / 4 Spd
Nature: Modest
trick
thunderwave
grass knot
psycho shock
I don't know if it really needs grass knot, as that's just to beat Starmie and ground types, the latter of which are probably handled just fine by tricking aiming mark to them and paralyzing them. The EVs give it almost balanced defenses, while still letting it screw over Porygon-Z and Genesect by giving them attack boosts instead of special attack boosts, enough speed to outrun Snorlaxen (who rarely invest an extra point in speed), and enough special attack to get the extra point with the nature boost, bringing it to 330, which is pretty damn good for a poke intended primarily as a team supporter. If he get's lucky, trick will nab him leftovers from a ground type, instead of choice band, or something awful like that.