Yes, there are several places you can find the random Pokemon Platinum Action Replay codes but http://codejunkies.com/ is the official place for your Action Replay codes. For anything not there, I would just use Google.
you have to purchase an action replay. then, you can type in Google.com and research Pokemon platinum action replay codes.
unlock codes
search platinum action replay codes then import the code to the action replay
YES. there are billions of action replay codes for platinum. i would tell you some, but i dont use the action replay. (i suggest not to ethier)
You can google it
chdhdhdgdhwdijwuhd374568787878hjvklvfjvlsjcdhfjv.vmgjgtlfvfvhgti897t9
yes
google it
you can't
kj gfa wqaw
The action replay itself can be found in any gamestop the codes are scatted tho the web
because your action replay is torn up or has a glitch.