Battles are in modules, start battle, when select this go to long and write the id of combat you desire. To see the combat id use the proud clod in scene magnement , pay attention because the number id in proud clod is a hexadecimal number but the makou reactor use a decimal, so you must change the hex to decimal.
For example combat 01DF(hex)=479(dec)
you write in makou number 479
Sorry for my bad english