I think you go to the Krawl planet and i think kill the nest....I am about to i got the anchaint spaceship lol

its true i am on the last boss just kill the boss's at the end

get 2 inkaflare augers and train them to lv 90 they will be able to do 200 points in damage per hit or more. in battle set there comand at charge so u can charge the gauge faster use the flame geo you get at area 2 of planet genshi then charge again and attack with the combo. then destro the mushroom (the 2 krawl will come back if you destro them)then the boss before the mushroom comes back as a zombie attack him til he puts up the sheild. use the geo to brack it. he will start to heal. continue to attack till dead