For Pkmn Diamond and Pearl, there are ways.
You only need an R4DS or something like that, but R4 works best.
You select but not start e.g.Pokémon Diamond, press Y instead of A and then you're sent directly to the Cheats menu.
Another is this weird thing with the bike, I can't remember the name anymore (please edit if you remember). You need a bike and you need to put in the highest gear, and very quickly after each other press LEFT and RIGHT, while holding UP pressed. The best place to do it is Jubilife City, from the downside to upside, if you understand what I'm saying. For more information on this, go to YouTube, since I'm no expert in this. (I'm not responsible for the screwing up of your game if you try #2 since that's possible, though not a high chance, it's your own choice and you want to cheat...).
i don't think you can!
You don't
you need action replay
you just cant
u dont
no wrong you can cheat without action replay like walking through walls it work but is super hard and you don't want to keep trying and trying
no you can not
what is the action replay cheat on Pokemon diamond for run through anything
There is no cheat you can only battle him once!
You dont
there is no way to catch a ho-oh without a action replay/ other cheat accories
action replay
no you can only use a i-cheat or an action replay
im sorry but you need gameshark or action replay for cheats
you have to have a action replay for ds
There might be a action replay cheat code but I do not think its possible without the action replay. I am serios but sorry I do not know the cheat code.
There is none.