Mario's Counter Picks

With good timing, Mario's Cape can prevent several characters from recovering onto the stage, as an effective edge-guarding tool.

FLUDD is effective against Simon / Richter, Little Mac, Chrom, Ike, Cloud, Lucas and Ness Up-B recoveries, be sure to save a fully charged blast against these opponents.

You can go in with a fireball to force to opponent to shield and then grab, but make sure you mix up your approaches.

Mario isn't very effective against most swordfighters, because they outrange him. But, if you're good enough with him, you may be able to edge-guard them.

Use F.L.U.D.D while the enemy is landing looking for an aerial and you can get a nice punish, they never expect it.