In Pokémon Diamond, you can obtain Deoxys by attending special events, as it is not available through normal gameplay. One such event was the Pokémon Ranger: Guardian Signs distribution, where players could receive a special item to unlock Deoxys. Alternatively, you can trade with players who have Deoxys from other games or events. If you're looking for a legitimate way, keeping an eye on official Pokémon events is your best bet.
you Google cheats for Pokemon diamond and something will pop up
u hav to find all of the Pokemon in the national pokedex
yes if you put on to many cheats
You probably caught it at pal park. This means that you migrated it from ruby/sapphire/emerald version. There is no way to catch a mudkip without cheats in Pokemon diamond. I'm sorry to say that it is impossible to catch in Diamond without migration or cheats: This is the guy who found torchic (not in pal park). I found it licking honey off a tree.
I don't think you can... but you can in Pokemon Diamond, Pearl, and Platinum version you can use WFC (wifi) to obtain the member card ( I think that is what it's called) OR use cheats but all I know is you cannot catch it Pokemon white without cheats
you do need cheats
You can't without cheats.
tradefrompearl
transfer from emerald
its impossible without cheats
see 450 Pokemon in the pokedex
You can't.
in a fossil
Darkrai.
put me in Pokemon
Trade with people.
You can't.