I figured out a **** load of Peach trixies. She's GOOD and VERY TECHNICAL.
-Down air to grab might be gauranteed if you purposely dont connect the last hit. I set tthe CPU to jump and he doesn't get out of it in training mode. You HAVE to fast fall the dair.
-Out of shield, a turnip wont hit someoen if you are too close. Instead, short hop to turnip down throw them. This will knock them back. At low percents you can have a guaranteed nair follow up and re catch the turnip. At higher percents, a back air is GAURANTEED. This is an insane way to get a kill if you shield an attack, because their move will probably lag enough for that turnip down throw to connect, and from there the bair has to connect. Training mode considers it a combo and i've done it on real people.
-Do not a short hop but a full hop, but cancel the full hop about 1/2 of the way to a peach bomber. This peach bomber will be spaced just right to auto cancel if you wiff it, but if you space horizontal distance, you will be low enough to hit them if they are in fact there. It's like a risk free approach unless they can time themselves to hit your peach bomber which i've so far never seen anyone good enough to do, they either dodge or shield or get hit.
-If ZSS is charging her downsmash while you are holding ledge, return with a far. You'll dodge it and fair her. This didn't work in brawl but works here.
-Don't be afraid to UP B kill people who are really high up. they will NOT see it coming. Think metaknight's up B in brawl. Once people get used to it you can use it to bait air dodges and up air instead.
-If you ground float fair, retreat and wait til you can autocancel fair, land, this is a safe way to approach.
Here's one more:
-Fox trot instead of dashing. It's considerably faster. (Keep tapping forward to repeat the initial dash animation fo Peach)