Sheik: 50% Sheik dittos! Oh, gotta love those! Ha, well basically Sheik dittos can be broken down very simply.
Grabs: Chain grab, Sheik can chaingrab Sheik from about 0-90% if no platforms intrude. If the opponent DI's off the ledge, you can fall off and F-air them and then hop back on the ledge for an edgeguard. Though it's lame, people are going to do it to you, so get used to it. At the% which they can escape, do an aerial to get them off the edge. If you don't want to grab, do the standard Dthrow-->ftilt-->fair and just combo from there.
Edgeguarding: Sheik is one of the only characters you actually DON'T want to really go out after. In a few select situations you can hit her before she's invulnerable, but mainly just stay on the ledge and make her use her up+b onto the stage. If sheik lands back on the floor of the stage, you can grab and do a combo, or you can ledgehop an L cancelled Dair-->Fair if they're close enough for it to hit. If Sheik lands on a platform, I like to hit them with my F-air, but hit with the back part of it so it sends them backwards, right back off the stage. I'll have a video of this later, also VERY useful vs. captain falcon.
Approaches/priority: In this matchup, L cancelling and playing smart is necessary. DON'T GET GRABBED! L cancelled F-airs into a shield are good, and if their shield is low you can do a Dtilt to swipe right under their shield. Dtilt is great in Sheik Dittos. If your opponent still has plenty of shield, and doesn't come out of it, you can L cancel a F-air and then just grab them, something Sheik players don't do enough in any matchup. People expect Sheik's to just spam moves, so L cancelling against a shield into a grab is great. Sheik's Dsmash does well too, because a lot of Sheik's are spotdodge/sidestep happy. Ftilt Fair works well also, and Down airs are good if you can catch your opponent attempting to Down smash.
Di'ing Sheik's Gayity: Basically, you always want to attempt to DI away from Sheik. Her tilts away, her chaingrabs off the edge or to a platform. Make sure if you DI her chaingrab away, on the last throw when you fall off the edge, DI UP AND IN so that you survive the F-AIR when she falls off and does it. Hopefully, though, it's not FD and you can get to a platform. The best way to DI sheik's F-air is Up and slightly in, so if you're dying at 80% from it, you're probably DI'ing wrong.
