Super Robot Taisen MX Cheats

Secret Mecha
Black Great Mazinger - Tetsuya must have a total kill count of at least 50 by the end of stage 45.
Dijeh SE-R - Judou, Rue, Elle, Beecher, Mondo, Iino, Puru and Puru Two must have a combined level of at least 200 by the end of stage 22.
Full Armour Dendoh - At the 2nd route split go to the Moon. On stage 33, the Dendoh pilots must have at least 25 kills together and have to go into the Aldeberan first.
Mass Produced Great Mazinger - On stage 38, have Boss destroy any of the AI piloted MP Great Mazingers.

Glitch: Easy level up to 99
When you begin Chapter 34, your reinforcements have an auto 5 level increase. The way to lose is to let GEAR Fighter Dendoh die. When it dies, you will get to restart the level and this is the glitch, continous dying will lead to lvl 99 in no time for your reinforcements. Everytime you rebeing the match, your reinforcements will automatically have an increase of 5 levels.