EV Training Help (Competitive Battlers ONLY)

[Skychi]

Alright, I have a couple of Pokemon here that need help.
___________
Rhyperior @ Earth Plate?
Impish (F) Unknown IV's
-Hammer Arm
-Avalanche
-Stone Edge
-Earthquake

I would appreciate any suggestions.

Also, I need to know good EV spots where I can focus in attack. I'm not working on his defence. It's great enough.
_____________
Dusknoir @ ?
Brand New! Untouched
-Will-O-Wisp
-Shadow Sneak
-?
-?

I need suggestions on his moves and what nature should I get him.

Also, how should the EV's look like? Thanks alot in advance.