Yeah, if you're using a DS Lite or DS Original, start the game about one second before, so if bit's 00:00:30, 00:00
RNGing is much easier on Black/White 1 then 2, if you have Black or White 1, I would use that. And yes, you need Chatots, at least, it's the easiest way I know of. If you don't have one or a Generation IV game, just ask for one in the Generation V trade forum.
Finding your parameters is also easier because of there being fewer Timer0s.
I find it easier to breed Pokemon than to find them in the wild grass, but that's my personal preference, and it takes a little while to figure out. (I actually have no idea how to get the right Pokemon when RNGing in the grass xD)
Does that mean that it's easier to rng shiny flawless eggs in BW than in BW2?