I wonder if we were able to master Cape teleport could Mario destroy MK's planking?
No, because Metaknight would have to have a hurtbox that we can cape.
When planking... he doesn't, plus, from my studies Cape Teleport only affects auto-ledge snapping out of Up-Bs, and no MK in his right mind is going to use Up-B to plank.
And guys... good luck timing out good players, seriously. Our planking is terrible when you consider the fact that trying to use Up-B in order to plank is punishable and gives us RCO lag, honestly... we shouldn't ever be planking at all, unless we're looking for an opportunity to get BACK on the stage.
I say this because I strongly feel that being on the ledge is one of Mario's worst positions ever, if the opponent is playing a GOOD character (or if they're a good player in general), they're going to be able to punish any option you use to get back onto the stage, unless you play it completely safe, we have much better options than running to the ledge.
For instance, if, like Big O said somebody is pressuring you too hard and you're uncomforterable, you have WAAAAAY better options than running to the nearest ledge. You could Up-B them OoS in order to break their momentum, Usmash/Dair/Bair-> Run away, anything to get them off your ***. They're much better options than running to the ledge like a scared little Metaknight (except Metaknight is actually GOOD at planking), and losing a stock because of it.
Camping is good though.