Mario
Punch: Press A just before the first punch connects.
Hammer: Press A midway through the first swing.
Shell: Hit A again just as the shell is about to touch Mario's foot again after it was tossed up.
Jump: Just as you're hitting the guy press Y.
Super Jump: Same as Jump, just you keep bouncing if you can press Y.
Ultra Jump: Save timed hits as Super, just you're hitting multiple enemies.
Fire Orb: Press Y as fast as you can to charge up and cause more damage.
Super Flame: Same as Fire Orb...just more powerful.
Ultra Flame: As powerful as Super, just you can hit multiple enemies.

Mallow
Punch: Press A as you make contact for the first swing.
Stick: Midswing is the time to press A.
Cyballs: Right before the two cyballs hit each other is the time.
Thunderbolt: Press Y just as the storm is subsiding.
HP Rain: As the storm's sound effects wind down, hit Y to cause a more powerful downpour.
Psychopath: As the two spotlights converge on the target press Y to read minds.
Shocker: Rigt as it appears is the time to press Y.
Snowy: Rotate the Control Pad during the entire show to cause more damage.

Geno
Punch: Right before Geno's arm detatches is when you press A.
Shot: Press A just before the guns go off.
Geno Beam: Hold Y untill you've got three stars, then let go.
Geno Whirl: Press Y right after the rings leave the screen to do 9999 HP Dagame
Geno Blast: Just like Geno Beam, only more powerful.
Geno Boost: Press Y just as the sounds reach their highpoint.
Geno Flash: Just like Beam/Blast, only alot more powerful.

Bowser
Claw: Hit A just before the claws make contact with the enemy.
Chomp: Just as the Chomp latches on is the time to press A.
Glove: Using Hurly glove, hit Y just as Mario connects.
Terrorize: Rotate the control pad as fast as you can to freak enemies out.
Poision Gas: Rotate the control pad to cause more lasting poison to seep into enemy poors.
Crusher: Just as the rock slab makes an appearance is when to hit the Y button.
Bowser Crush: Press Y as quickly as you can to cause more crushing damage.

Toadstool
Glove: As the hand is about to hit, hit A.
Fan/Parasol: Hit A just as you make contact.
PanJust as you're about to whack the enemy is the time to press A.
Therapy: Just as the sparklies are finishing, press Y.
Group Hug: Identical to Therapy, just you heal everyone.
Come Back: Just as the star hits the ally, Press Y to make a full recovery.
Sleepy Time: Rotate faster to cause a longer nap.
Mute: Rotate fast to silence longer.
Psyce Bomb: Press Y quicly to cause a bigger explosion.