That's a really cool strategy! But isn't there some poke that can Spike, DT and BP, and possibly T-wave, Spore, Yawn, etc.?
The problem is that after 6 DTs (the max), you still only have a 66% no hit chance, which gives you a 1/3 chance of getting hit.
Another problem... are moves like Will-O-Wisp accuracy-based?