EV stuff Action Replay Code for Pokemon Diamond

First, you must use this. It lets go passed 512 base stat limit.

120847F4 0000FFFF

Then use these at the same time as the code above:

HP Up raises HP to max

12084576 000046C0

12084AFC 000020FF

Protein raises attack to max

120845E2 000046C0

12084B5C 000020FF

Same thing with defense (Iron)

1208464E 000046C0

12084BBC 000020FF

And Sp. Def (Zinc)

12084796 000046C0

12084CDC 000020FF

And Sp Attack (You should know this)

1208472A 000046C0

12084C7C 000020FF

And speed (You should know this too)

1208472A 000046C0

12084C7C 000020FF

Simply use all codes at once (even the first one), and when you load up your game, simply use one protein and it will raise attack to the pokemon's max. (Or Calcium for Sp. Attack and stuff like that. Or use all if you want)

And for absolutely max stats use those codes with this

12066C9C 0000201F

12066CB2 0000201F

12066CC8 0000201F

12066CDE 0000201F

12066CF4 0000201F

12066D0A 0000201F

This will make wild Pokemon have max IV's (not Pokemon you already have though)

If you decide to use these moves with a wild Pokemon code, half the time the wild Pokemon wont show up, so you have to try a few times.