Enter the Navi Customizer screen and highlight the indicated Navi Customizer Program. Then, hold Right and press one of the following button combinations to compress it. After getting compressed, the Navi Customizer Program will be one block smaller. Repeat the code to decompress the program.

Program - Code
AirShoes - B, L, B, A, B, L, B(2), A(2)
AttackMAX - L(3), R(2), B, A, R, B, L
BatteryMode - A(2), B, R, A, B, R, L(2), R
BeatSupport - A, B(2), R, A(2), B, R, B, R
BodyPack - B, A, R, A, B, R, L, R(2), A
Bugstopper - B, A, B, L, A, B, R, L, R, B
BusterPack - L(2), R, A, R, L, B, L, A, R
ChargeMAX - A, L, A(2), R, B, R, B, A, R
Collect - B, R, A, L, A, R, B, A(2), B
Custom +1 - A(2), R, L, B, A, B, A, L, B
Custom2 - B, A, R, L(2), R, A, L, B, R
Dandyism - R, R, B(2), R, B, R, B, A(2)
First Barrier - R, L, A, B(2), A, R, A, L, R
FloatShoes - A, L(2), B, R, L, A(3), L
GigaFolder1 - R(2), L, B, L(2), A, R, B, L
GigaVirus - B(2), R, A, L, B, L, A, R(2)
HumourSense - A, B, L, A, R, A, B, L, R, L
KawarimiMagic - R, B(2), A, R, B, R, A, R, B
MegaFolder 1 - B(2), A, B(2), R(2), L, A, R
MegaVirus - A(2), B, L, A, R, B, L, A(2)
Millionaire - R, L, R, A, R(2), L(3), R
RapidMAX - R, A, R, L(2), R(2), A, B, A
RushSupport - R, B, L, R, B, R, L(2), R, L
SaitoBatch - A, L, R, A, B, L, R, A, L, R
SelfRecovery - R, L, R, L, R, B(2), R, A, B
Shield - A, B, A, R, A, L, R, B(2), A
ShinobiDash - R, L(2), A, L(2), B, A, B(2)
SuperArmour - R, A, B, R, A, L(2), R, B, A
TangoSupport - L, B, L, A, B, L, A, B, A, L
I'm Fish program - B, A, B, A, L, R, A, R, A, A
JungleLand program - L, R, L, A, B, L, B(2), L, A
Oil Body program - L, B, R, A, R, L, A, B, L, B
Reflect program - L(2), R, B, L(2), A(2), L, B
UnderShirt - A, R, B(2), R, L, R, A, L, A