As many as you like, it wont break if you add too many in.
insert the action replay than take it out and put heart gold in.
To enter action replay codes plug in the action replay and start the console. For activators they should be in the code description.
what you do is you put the game in the slot on top of the action replay then put it in your ds. then turn your ds one and it then you click codes it will say Pokemon mystery dungeon explorers of time. Then it will give you the cheats for the game.
I don't believe Metroid Prime has cheats...although they do have Action Replays.
You can't enter them in diamond. you have to buy an action replay and enter them in there
jj
you have to click on the pencil and then enter the name then enter the code!
You enter them on Action Replay, then activate them.
you have to look online or have an action replay.no matter what you have to have an action replay to enter codes on ds with action replay or not. it is weird but you should figure it out. i dont have an action replay but i do just so happen to know a LOT about technology and how it works...:);)
Sorry,no
No
You must have a cheating device to enter codes for any game.