If you have any questions about PSImag, PK JUMP, dtilt, dash attack, bair, or FH aerials, ask me.... xD
Otherwise, I agree with yink. You can't "plank" but ness' manuevering allows him to attack well surrounding the ledge. Just don't go TOO aggressive or you'll kill yourself by fluke.
In order to do that, you must know two things: your DJ height to get to the ledge perfectly, and the actual lag of all your moves. It helps to use bair, as it is a layout type of thing and gives you a slightly higher possibility of moving onto the stage to land... Ya know snake's bair? Think of that on a down-graded scale... I like ledge-game... It makes ness better...
Ness has some major parts of his game that, when all mastered to be used seamlessly, bring out the best parts of ness. In order of priority to one's learning, here they are, IMO:
Pkt2 angles and directions,
Aerial spacing/timing/landing (with every usage... Not just FH or DAS..),
Grab lead-ins and mindgames to make a person run into your grab capabilities,
Spacing the quick ground moves (utilt, dtilt, ftilt the most),
Projectile pressuring with Pkt and pkfire (must know how to space EXTREMELY well)
And PSImag healing and gimmick-ing.
