I am trying to get suuicune, but i'll need to know what I should do to run into it, as I have not seen it yet. Oh, and I blew my master ball on . Yes, I'm an IDIOT. Right now, I just walk around and always have my with sleep powder in the front of the line at all times.

First, go to a place, like to north of vermilion city, that you can enter and exit some building, in this case, the underground path. Take loads of max repels and a pokemon below level 50 in the first place of your team, so you only have the chance to encounter the dogs. When you find it for the first time, weaken it the maximum you can.
Then, try to encounter it again. Take a team of wobbuffets with the Shadow Tag ability (which prevents the dogs from running) and keep throwing ultra balls until you get it.
That's what I did and they got in all around the 10th ultra ball I sent.

I'll tell you what I told the last guy:


And btw, I don't know why someone would blow a Master Ball on such an easy-to-catch Pokemon. Mewtwo is far harder to catch (he's almost impossible w/o a Master).

It kind of depends... I've never used a master ball on Mewtwo because he can't/doesn't flee, and I've never had TOO difficult a time of catching him (I believe I used around 10 ultra balls) but the dogs (and let's say you don't have a wobbuffet (or however the world you spell it)) can and will flee if you don't catch them right away.