I have a 2 smeargles and they are good (For smeargles)
Smeargle No.1Item: Quick Claw (Or any drive)
EVs: 252 Sp.atk, 252 Speed, 6 Defense
IVs: Sp.atk, Speed
Item: Leftovers (Or any plate for move boost)
Nature: Lax (Bold would work too but that's less physical attack, decreasing the power of V-create and Land's Wrath)
EVs: 252 Speed, 252 Defense, 2 Sp.Def
IVs: Defense, Sp.def
Both will be very fast, and are able to put oopsing Pokemon to sleep. You may also wish to give Smeargle No.2 water shrunken for priority.
Bear in mind these are smeargles, however, and all the diamond storms and Judgements in the world won't make them much better than weaklings that don't OHKO Foongus with oblivion wing.
PS If anyone likes Smeargles I wonder trade away lvl. 14 ones with judgement :)