My thoughts on the whole "what can we get from Valkyria Chronicles" is as follows.
The tanks are old, clanky, and have extremely obvious weak spots- the radiator on the back (or top, depending on the tank.) Their guns are bolt action rifles, submachine guns, sniper rifles, and an RPG crossed with a lance. Ragnite may be a viable alternative resource, it's used in medicine, explosives, and fuel for vehicles so that might be something to look forward to. But overall they just don't have much to offer us...
Except for the Valkyur stuff. I doubt Robotnic has any Valkyur blood, so he won't be glowing blue and firing lasers from his palm any time soon. But in one of the games a young Valkyur is used to power a prototype icebreaker battleship, and it goes great! So for the price of one sad girl, we could potentially produce a lot of power.
There's also the Artifical Valkyur stuff Max was supposed to be working on. Now, there are some flaws. Such as overheating, reliance on support vehicles, and having a tendency to drive the user insane. But the Artificial Valkyur are endowed with highly resistant armor, prototype beam rifles, and shields. For some reason. Now, I'm not saying we should make Eggman put it on. But we could say... make a special Badnick which uses the beam-rifle lance and spiral shield.
Of course, we're getting ahead of ourselves. That is stuff we could maybe do in the future, not stuff we're ready to do now.