so i have a shiny scrafty, it's nature isn't great but i can easily make it work

it's got a naive nature which lowers sp def and heightens speed

so i figured I'd give it 250 in speed, 250 in Attack, and the rest in defense or something like that, I do horde EV training so it works out something like that

Now, for it's nature, I'm gonna run assault vest, and since scrafty is already a nice bulky pokemon with good defenses on both end, I only need to pick some good moves

I figure Knock off for dark stab and removal of items
Dragon tail to force a switch for a bad match up, coverage
Drain punch for recovery + stab

And I'm torn between power up punch and poison jab for fairy types

opinions?