A1: You must find him and fight him on secret areas on the interior Arctic, Desert, and Jungle areas.(The missions that take place inside a facility)

An easy way to beat Stormshadow is to make sure you have the accelerator suit.

The three locations for Stormshadow are as follows:

1) Arctic - Code Name: Deckhouse Six

During checkpoint 2, in the section where Data Frame apologizes to you, and informs you that he needs to get through a firewall and tells you to hold off the enemy for a few minutes. There are two paths on the right side that lead to the two consoles you need to activate to continue to the end of the section. Once all the enemies are defeated, and you activate both consoles behind the barriers, head to the door between the two paths that lead you to the consoles you activate on the right side.

2) Desert - Code Name: Robot

During checkpoint 1, you will come to a room where Dusty informs the Joe's that there is a situation in Apep Canyon. This room has three doors. One straight ahead, one on the left, and one on the right. You want the door on the left once all the enemies are defeated and the barriers are down.

3) Jungle - Code Name Sludge

During checkpoint 1, in the section where you need to destroy the computers, then activate the two consoles to drain the two green tanks. Once you do this, two doors will open. One on the left, and one on the right. The door on the right is a straight path that takes you through another two doors (one already open).