Practice, practice, practice. As the old saying goes, practice makes perfect (well, almost perfect). Also, try to find your best character and utilize that character.
Do multiple-hit moves, which is, for example, hitting a person once, kicking them into the air, and then hitting them off of the stage to lose a life. That was only one example, but it works if you have a light enough character (can be done with heavy characters, but very hard. There are many other ways of doing multiple-hit moves, too).
Match weight. If your brother is going to be Ganondorf, then choose a heavy character. If you choose a light character in this situation, one hit will send you flying, and a few more could send you down-and-out. Opposite weight matches are only recommended for experienced users.
The most important thing to do is analyze his style. If he does a lot of close-combat attacks, choose a medium to heavy weight character. Light characters would lose in close-combat (Falco is recommended). If he is a long range combat person who utilizes items, choose a medium to light weight character which can Dodge attacks with ease, but also work with close and long-range combat (Marth recommended). If he is an all-around combat person, choose a medium-weight character (Luigi recommended).
You must mean Super Smash Bros Rumble. I don't know, but my brother had it.
Play Super Smash Bros Brawl with other players.
Marth doesn't have a brother.
me
Beat them when they are a challeger
sonic the hedghog can beat link...
Beat the subspace emissary
On every Smash Bros. ever made, all you have to do is beat Classic mode. (Or Adventure Mode for Melee)
Super Smash Bros., Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS/ Super Smash Bros. for Wii U, Super Smash Bros. Ultimate.
Super Smash Bros., Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS/Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate.
Beat classic mode with 13 characters then beat marth
you have to beat event match 25