I'm not a jiggs player, nor is jiggs my secondary, but I think I can say that one advantage that jiggs has that only peach has is the ability to chase someone off the ledge and completely push them off.
Now, keep in mind it's not always the best tactic since somebody could actually catch you with an air while they're recovering, if you could hit somebody with say, a bair, and follow them out and continue fairs before they get out of their recovery frames, you could push 'em completely off (or into a real bad position atleast).
As for actual edgeguarding, if someone's a ways out, you could fall a little ways and go for a bair, or you could fall on em and do a nair and trade with them (if it's safe to trade with their up-b). It's not always a safe option, but I play against a jiggs player who does that to me alot, and it's sometimes successful.
obviously, if you're going to go for rest, make sure that you will hit it. Kinda goes without say, but i've seen people try it for no reason whatsoever.
Speaking of rest, there are a few rest tricks/traps/combos that are pretty good.
- On fox/falco|| Uthrow -> rest || They can di out of the throw, and if they do dont try it, but if you get em to go straight up, you can rest them @ 0% (prior to the throw, that is)
- many characters (pretty much anybody who doesnt float, i think) || DThrow - Rest || Again, they can DI out of this (DI means directional influence, btw), and they will have more time to DI out since it's a slow throw, but again, if you catch em sleeping, there's a chance for rest if you want it.
- "The" jiggs combo || (falling uair) -> utilt -> rest || I put the falling uair in parenthesis because it's not specifically required. You'll do it if you're trying to do this combo offensivly (i.e. falling into somebody for the falling uair). But all you need is the up tilt to pop them up (which can be done as a counter to a miss) and then go for rest... or chain a few up tilts to be safe. However you play.
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Again, i'm not a jiggs player, nor do i claim to be one on tv. I just play against jiggs alot, i've messed with jiggs some, so i
think I have some helpful advice.
Dont take what I say to heart.
But like pine says, the sure fired way to get some advice is to watch some videos of some good players. (And yes, you can find videos of bad players, so make sure you find the good ones >.< )
Watch em, take what chya like, practice it, and you'll get your own lil twists once you start getting successful.
http://www.youtube.com/watch?v=aOMtfk45CSI
here's a good combo video by TheKing, which shows some kool stuff, and has (what I believe) the most valuable quote in SSBM.
"You are not better than me, nor are you worse than me. You do a certain style, I do a certain style. That is all"