Here's the rules:
1-on-1: Have 1-on-1 battles with random characters, but end with Mario(always play in their stage). Ness will use a Random stage. You cannot switch characters, or fight against yourself. Take on Mario in Peach's Castle(Luigi has the mushroom kingdom). You can put them any way you want, or even choose a new boss. You can also put it in a perfectly normal order. For instance, go from Donkey Kong, Link, Samus, Capt. Falcon, Jigglpuff, Pikachu, Fox, Kirby, Yoshi, Ness, Luigi, and finally Mario. I've done this, and it's fun.
Lives: You can have one stock or more.
Continues: Up to five, it chooses your rating.
Weapons: Choose six random, and add two more in the battle against Mario.
2-on-2: This one is more fun. First you must set up as many teams excluding Mario and Luigi. If you don't have Luigi, use Yoshi instead. You cannot repeat characters at all in the teams, or against. E.G. You could be vs. Samus and Starfox, but you can't vs. Samus and Yoshi. Play all the rounds till you get up to them. If your team loses, the other team advances to the next team. If you win, you advance.
Weapons: Have 8 total, and add two weapons against Mario and Luigi/Yoshi.