I've been stuck at the Ground Zero mission, the fight with the Hero Dekapon, respawning demons, and that weird mushroom thing. I have the Dekapon's attack pattern down, three attacks, three standing there like an idiot phases. I've come close to beating it, I think. I've reached three "phases" in the battle, where the mushroom moves back, or the Dekapon and the Star start talking, or whatever, but I just can't survive long enough.
Grinding is actually kinda fun though. I've really started getting into those egg missions, finally found the upgraded speed mask which I've been dying to find, but think I'm reaching a point in some of the battles where the COM players are just too stupid to help me win in time. Can you play multiplayer online, or is it just PSPs in the vicinity of each other? I'd like to get some people together if possible to run egg missions, but I doubt it will happen if you can't play online.