In stratego what can a spy do?

Red Spy,Blue Spy, Black spy and White spy are the spys

Yes, you can.

Well, any piece beats a flag. Even though the spy is so weak, it still has the right to capture the flag.

In the game Spy vs Spy on play station there is red, blue, white and black spy

It is Brittney. I am not sure I spelled her name right. I am also not sure when she becomes a spy.