Instructions
PLAY MIND GAMES. Smash Bros Brawl is all about controlling the match, and nothing works better than keeping people guessing. The harder your actions are to read, the more likely your enemy will fudge and you will be able to gain the advantage. Random movements, intentionally taking a hit and standing still are all examples of mind games.
LEARN KILL MOVES &HOW TO GIMP. A kill move is one that you can count on to KO an opponent without fail. Find out which moves are the most reliable, and use them whenever you need a KO. Gimping is when you KO at a low %, and it can be done by spiking or by throwing your opponent off-screen early on certain stages.
GUARD IMPACT AND DODGE to reduce the amount of damage you take. Pressing the shield button just as you are about to get hit will trigger a guard impact, and will allow you to immediately counterattack. Dodging completely avoids damage altogether, and can be done multiple times while airborne to get back on the stage safely.
EXPERIMENT. Try using attacks for other things then what they were designed for. An example would be to use Wario's Chomp on an opponent while underneath the stage ledge so that the person bounces off the underside at such an angle that they fall off-screen and get KOed. There are all kinds of possibilities waiting to be found.