Which accessories deal the most damage? High powered? WRONG. Edging accs deal the most damage.
Ring outs give INSANE damage. Some accs have edging specials like Powerful Drill and
Chinese Spear. Most styles have their own edging specials like knight and fighter (knight is my favourite).

Although these edgers are really strong, some are slow and hard to aim like the knight special and the Powerful Drill. How do you make sure you don't waste mp using edging specials? Go to your weapons and change it to short bow. When a player is hit by a short bow, (s)he gets stunned for about a second. Use that second to aim and shoot your edging special. They'll be defenseless. Sure edge. The good thing about the bow is that it's mid-ranged so you can stun 'em from afar then move in for the edge. Also, don't be afraid to miss. It won't eat up mp to use the short bow (as it is assurance that you will hit your opponent).

Follow this and you'll be edging likabawss!!!
WARNING: Do not abuse/spam or people would hate you. Use only once in a while... unless it's a No Rules battle (my favourite). If so, knock yourself out.