How do you kill the ch 6 monster in lost planet 2

Depends what difficulty you are on. First you have to find the VS weapons(there are no VS) than you use them to destroy the ball like things at the end of the over-g. When they are weakened there will be like a rock looking thing go up to it and it will say press b to plant GPS this is for the xbox and for the playstation its the o button. and if your playing on live tell every one to do the same. And if your playing by yourself you are the only one that needs to do it.