Button Combination Legend:

QCF - Down, Downforward, Forward
QCB - Down, Downbackward, Backward
DP  - Down, Forward, Downforward
BF  - Back, Forward

Special Attacks:

NES Zapper Shot - QCF_x or y 
Crouch NES Zapper - QCF_a or b
Powerglove Rush - QCB_x or y
Pencil Throw - BF_x or y
Crouch Pencil Throw - BF_a or b
Nintendo Super Scope Shot - BQCF_x or y (You can use this attack in air too)
Crouch Super Scope Shot - BQCF_a or b
Press here you dumb fuck - x+y or a+b
Unfair Throw - When you're near p2 press y

Hyper Attacks:

LvL1 Plane Crash - 2xQCF_x or y
LvL1 Heavy metal powerglove punch - 2xQCB_x or y
LvL1 Fully charged super scope - 2xQCF_a or b (You can use this attack in air too)
LvL2 SMDC Attack - QCB,QCF_x+y 
LvL2 F-Bomb Drop - 2xQCF_x+y
LvL3 SUPER POWER GLOVE (TRUE POWER) - 2xQCB_y+b