To enter these codes, have the desired Navi Customizer Program highlighted in the Navi Customizer screen. Hold the Right (->

button on the D-Pad, then enter the 10 button code (Composed of different combinations of the buttons A, B, L and R) for that NCP to compress it.
Once compressed, the Navi Customizer Program's size will be reduced by one block, or square. Only non-textured programs can be compressed (AutoRun cannot be compressed either), and inputting the code again will decompress it.Code Effect
BLBABLBBAA Compresses AirShoes
LLLRRBARBL Compresses AttackMAX
AABRABRLLR Compresses BatteryMode
ABBRAABRBR Compresses BeatSupport
BARABRLRRA Compresses BodyPack
BABLABRLRB compresses bugstopper
LLRARLBLAR Compresses BusterPack
ALAARBRBAR Compresses ChargeMAX
BRALARBAAB Compresses Collect
AARLBABALB Compresses Custom +1
BARLLRALBR Compresses Custom2
RRBBRBRBAA Compresses Dandyism
RLABBARALR Compresses First Barrier
ALLBRLAAAL Compresses FloatShoes
RRLBLLARBL Compresses GigaFolder1
BBRALBLARR Compresses GigaVirus
ABLARABLRL Compresses HumourSense
RBBARBRARB Compresses KawarimiMagic
BBABBRRLAR Compresses MegaFolder 1
AABLARBLAA Compresses MegaVirus
RLRARRLLLR Compresses Millionare
RARLLRRABA Compresses RapidMAX
RBLRBRLLRL Compresses RushSupport
ALRABLRALR Compresses SaitoBatch
RLRLRBBRAB Compresses SelfRecovery
ABARALRBBA Compresses Shield
RLLALLBABB Compresses ShinobiDash
RABRALLRBA Compresses SuperArmour
LBLABLABAL Compresses TangoSupport
BABALRARAA Compresses the I'm Fish program
LRLABLBBLA Compresses the JungleLand program
LBRARLABLB Compresses the Oil Body program
LLRBLLAALB Compresses the Reflect program
ARBBRLRALA Compresses UnderShirt