Welcome to Gen VII competitive, where...well frankly I can't tell what's going on. Gengar without native Levitate, Smogon Bird no longer Smogon Bird-ing, it's gonna be fun. But we can ignore these changes to OU for now, since Decidueye will not be there. I like it well enough and chose it as a starter, but it has issues. Want to go offensive? Decidueye has some good attacking stats and a respectable movepool on both sides, plus access to the poorly-distributed Nasty Plot but...yeah, base 70 speed is no good, even if it is the fastest Gen VII starter. It even sucks in Trick Room. Okay, defensive maybe? Good Special Defense, okay HP, access to recovery...and poor Defense. Not spectacular. So what is Decidueye good at? Exactly what everyone's been saying: support.
My set of choice would have to be defensive defogger (see: gars129's set, minus Long Reach) but there is some concern over using Decidueye versus Dhelmise. Personally, I like the sound of Dhelmise a bit better given that it can spin and spinblock simultaneously, plus triple-STAB and better Attack is always nice, but without recovery it'd need Wish passing to have any kind of longevity. Kinda makes you wish these two had access to Giga Drain and/or Horn Leech. As for Decidueye's ability to trap enemies, it's pretty useful in general but realistically I'm not sure it can wall enough of OU sufficiently to be effective. It does handle threats that have only Scald for offense though, and that's no small matter.
Last edited by generic villager #5; 27th November 2016 at 11:56 PM.
The risk I took was calculated, but man, am I bad at math.