Much usefull attacks.
Mario&Luigi.
Mega Jump/Ghost Barrage/Frog Rampage/Ultra Fireball: Hit 4 all= EPIC WIN.
Frog Hygiene: Great healing.
BrobotBlast: All hit+SILENCE+epic suit=Awesomness.
Koopa Kaos: Big Dark Bowser+Huge amount of Darkness=Epicness.

my favourite attacks are brobrot blast and mega fire ball and koopa caos

Brobot blast (strong all hit attack)
frog rampage (strong all hit attack)
frog hygiene (one of the 2/3 actual healing moves)
koopa kaos (it's awesome and powerful)
minion barrage (read Koopa Kaos)
D-Down hammer (broke defence, what else?)
Rawk Hawk attack (lowers defence was pretty good with lazy shell/mini mashers)
and Reflect (was a gods-sent against some of the late game bosses)

those were basically... all I used when i got them XD

Sage Maplo Boost was a godsend to me.

My favorite is dark Bowser's basic attack, THREE HIT WIN!!!

Hmm.... Here's what I particularly like:
Sage Maplo Cure (Like what was previously said, a godsend. Fully heals everything and applies regen which lasts for a couple turns. Forget the high FP cost: If you have the right equipment you can halve that)
Frog Hygiene (Extremely useful for healing)
Brobot Blast (I only like it cause it's the best all-target damage attack for Mr. L suit)
Sneakiness (I spam this with vigor pin on mario and mini-mashers; It's a devil at dealing damage)