for example. this http://faqs.ign.com/articles/839/839263p1.html  am i allowed to add that to the cheats page of uncharted drakes fortune and just say that that guy made it not me?

Nope that would be plagiarism and it is not acceptable in VG Chartz

Ok, I haven't read it, but I will expand on it.

If there is no legal information posted, then it is copyrighted by the owner and you cannot repost. Also, if there is legal information and it forbids it (or doesn't mention) then you also can't repost.

If there is legal information and it says it can be posted anywhere so long as you don't take credit, then go right ahead. Sure you uploaded it, but their name is typically right at the top saying they wrote it.

And if it says you have to ask permission before reposting it, then ask permission. Etc.