Pause the Game at the specified screens. Either durring battle. While at the School(and or your Gladiators Page) screen or at the Office Screen or the Map.
Note1*Camera Mode controls - Analog-stick, C-Stick, Z, and R to control camera view. Someone may want to try it I never really used it myself.
A Noise will specify correct code entry.
Note2* Random Battles On\Off - This code works but I dont think the Random Battles on Code works as pressing A sends you back to the game or whatever you have highlighted. Also saving with it on may be a permenit affect so I would advise you not to use it unless you dont mind never running into Wild Battles.
When in the Recruit area of any League, you can Permanently Recruit any Temporary Recruit by simply selecting them when you do not have enough dinar's to spend. In other words, make sure that you have fewer Dinars than the temporary recruit costs. They will disappear from the list and appear in your school!
After you get the ability to raise undead legionaires, raise strip and expel them over and over until you have stockpiled enough equipment to make your fortune. In imperia alone if you do this around ten times it's worth at least a 100,000 coins.