Regarding Falco something i found,
His default side-sp has a meteor smash effect.
Also after you execute it you can input other commands.
(eg. up-sp for further recovery or jump, etc.)
Falco
side-sp#3 - Falco Charge - when hit at close range there is good knockback
down-sp#2 - Accel Reflector - only shines at the apex of the throw, make stuff reflected faster
Jigglypuff
side-sp#3 - Tons of pound - hits multiple times
Greninja (weird JPNenglish)
n-sp#2 - staying throwing star - throws out right in front of him and stays in place, hits multiple times
longer you charge longer it stays
n-sp#3 - changing throwing star - after it hits makes opponent go up when uncharged, pulls opponent in when charged
side-sp# 2 - intense shadow - longer distance but when shadow is moving its slower. hits stronger.
side-sp#3 - quick shadow - fixed distance, similar to default but can't charge to change distance also not as powerful but little knockback
up-sp#2 - Big Pump - shoots more water but slower speed, easier to change direction. (works like pikachu's up-sp)
up-sp#3 - Single pump - shoots straight up, can't change direction. (similar to megaman's up-sp)
down-sp#2 - Spark Bunshin(dummy) - disappears and creates a small explosion, not a counter move.
down-sp#3 - Charged Bunshin(dummy) - counter attack, attacks from farther away, stronger but slower, recovery delay is larger as well.
Link
n-sp#3 - rapid arrow - very short distance but quicker to shoot
side-sp#3 - cutting boomerang - shorter distance but hits multiple times, goes through opponent.
down-sp#2 Big bomb - larger blast radius, slower before ignition
down-sp#3 Meteor bomb - faster before ignition, when hit in the air has a meteor spike effect.
Marth
n-sp#2 - Storm thrust - similar to default but has a small tornado at the end of the sword, can blow opponent away.
Pikachu
n-sp#3 - electric shock - shoots a ball of electricity straight forward at a fixed distance. good knockback
down-sp#2 - self electric shock - electric surrounds pikachu, similar to default but without lightning bolt. hits multiple times, big knockback.