Your partner machine can evolve at certain levels. The levels are production level 10, 20, and 30. 10 and 20 simply do better synthesis, while 30 allows your PM to go into battle. Be careful as the stats which you give to your PM will determine what it looks like, how it fights, and what weapon it uses. I ended up with a mini-tooth-fairy looking little girl with a shotgun. It does a 200, 200, and another 200 on a direct hit on the De Ragan. I recommend purchasing Carline which does all stats +8 except attack, and normal Photons which do +2 for everything except -2 for armor. If a stat is leveled with now red XP it cannot back level so it can't reduce stats.