There is a back part on the roof where the MWM-SM36/1 stealth missiles can be found.
Gundamwingzero18.
Take your opponent to the Arena stage. Have Hectos Rockets and the left hand grenade launcher equipped. When the battle starts, start stepping backwards, making sure not to turn or alter where the aimer is pointed. Switch weapons to the Hectos Rockets and keep firing those with the grenade launchers. The opponent will just follow your steps, and will not move from the line of fire. If they get too close, start to fight normally; they will have low AP at this point.
JAE11511.
As the MWC-LIC-10 and the MWG-KARASAWA will be available on the shop, buy them. Then if you have the OP-INTENSIFY, equip them, or equip them on a quad-legged or tank-legged AC. Due to the fact that Arena enemies usually go directly toward you at the beginning without flying too high, when the battle stars, do not move and shoot blindly at the AC. If you picked up a long-range FCS, you will have better aiming. A long-range FCS is not recommended though; once the enemies will be near enough to shoot you, move out and shoot them. this works best against strong but slow ACs such as Silver Fox.
pupaino.