The skulls are hidden all over the map. To get them all you have to do is find them and pick them up.
Yes, you have to find them just like before.
ok, go to youtube and type in "how to find all halo 3 skulls" then watch the video and get the skulls. yes, its that simple.
You do not keep the skulls in Halo 2 they are a one level sort of thing.
Check gamefaqs.com, they should have a guide or map.
find the skulls
Sorry there arn't any, The only skulls are in "Halo 3" Which are used in "Halo 3 O.D.S.T."
Find them your self
There are no skulls in Halo Reach.
There are not skulls in Halo 2! It's just Halo 3!
The only things that would be counted as cheats in Halo 2 are the effects from the skulls when activated. More information on the Halo 2 Skulls is provided in the link below.
No, in Halo 2 you can not unlock armor.