Lol I think this may be the giddiest you've ever made me BPC
BAN ALL STAGES WITH LEDGES! BATTLES SHALL ONLY BE FOUGHT ON HANENBOW, BROKEN FLOORED SKYWORLD, AND THE PLATFORM OF PTAD!
You think I'm kidding?
If it turns out that the ledge on most stages poses an overpowering defensive position, like the fin on corneria or the circle on temple, then what? Well, you can't really stop people from using the ledge... The correct procedure would be to ban any stage with permanent ledges. That leaves, from the currently "potentially legal" stages:
-Castle Siege (debatable; ledge is only gone for approximately 1/3rd of the stage's total time
-Delfino Plaza (debatable; see CS)
-Norfair
-Port Town
-Brinstar
-Rainbow Cruise
-Pirate Ship (water makes it easier to come at the planker from below, again, debatable)
-Onett
-Frigate? (very fringe; the ledge is only unavailable during the flip, which is not much time to hit your opponent and not very often)
...of course this is ridiculous. The ledge is
not a broken defensive position for anyone except MK. While it may swing a few matchups (Falco and Oli especially eat **** on this count), there's exactly one character who breaks the ledge. Of the rest? None of them have remotely been proven.
You don't have to ban it. all you have to do is limit it so that it isn't used to safely avoid any contact with the opponent.
How? LGLs? Yes, I'm only allowed to grab the ledge so and so many times. I can still stall you out by aircamping and then planking for as long as the LGLs provide. Again, LGLs are only justified if planking is flat-out broken. Therefore, only for MK at this point.