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DoctorDub
I struggle a ton with that MU too. If he's super armoring through your moves, maybe try grabs? You'll either get hit (no grab armor) or actually grab him, which isn't good for Mac. Or you can just simply shield, just make sure it doesn't get broken. Once he's in the air, try everything to keep him from getting back down, be it simple dash attacks or charged Phantoms, maybe even Din's. If you get him offstage, go nuts. 90% of the time they'll either counter or airdodge when you jump towards them, so just wait it out (of course every player is different; if you see another pattern then adapt to that). All it takes is a fast falling nair and he's usually done, a soft dair will probably do it too. If he UpBs to the ledge try dsmashing him (since it doesn't ledge snap). Now, I haven't actually tried this (lol) but it SHOULD trade, and the angle it sends him at is basically death. Dsmash in general at the ledge is good against him, actually.
I don't have a whole lot to say about the neutral game, unfortunately. He wrecks us here. I usually try SH dairs then retreat or crossup afterwards. An occasional nair might catch him too, and it can start some low percent strings. You could try jabbing (not sure if this stuffs any of his approaches though...) and dtilting (dtilt has a lot of priority for some reason). Don't use any laggy moves like fsmash unless you really think it'll hit. Nayru's is good, but don't abuse it. It's works against him (and other fast chars like Sheik, Falcon, Fox, etc) but it can be baited into a nasty punish.
One more thing about catching his landings. Try baiting airdodges...a lot. His aerials aren't threatening at all, the worst he can do is a counter. Bait the airdodge then regrab.
I hope this helped some, I haven't fought many good Macs, but this is just some stuff in general I've noticed. I hate this MU too.
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Someone explain the Bowser and Bowser Jr. MU to me. I suck at them. I don't see what Zelda has over them. Bowser's ftilt and dtilt just beat Zelda's everything. Jr goes crazy with Clown Kart combos. Help.
EDIT: I hate those MUs with a passion, lol.
EDIT 2: About Mac...don't use Din's while he's onstage. He'll just run past it. Plus Din's in general is lol.