You cannot 'download' an Action Replay. It is a physical item that you must buy.
If you are looking for Action Replay codes for Pokémon Diamond, there are plenty of sites around. Liberal use of Google will find some for you.
ADAE-636791C0 is the AR ID for Pokemon Diamond
your computer needs to be windows download pokesav at www.pokesav.org connect the ar to the computer and you can create ar cheats, pokemon, and cause ANTHING to happen!!!!!!!
you have to get a code.
go to www.codejunkies.com and www.supercheats.com to find out AR Pokemon Diamond/Pearl codes for the DS
there is non
use ar
action replay
you need ar
its impossible without ar
you can't unless you have AR
no way
download pokesav and you can do it