you need azure Flute via Nintendo mystrery gift event!
ANSWER NO 2
you have to get the mystery gift and go to any poke mart (closest on oreborough city) and talk to the man in green and you will get the azure flute and go through mount coronet to where dialga use to be and give the azure flute any Pokemon and a magical stair case will apear and save on the stairs because when you step onto the diamond floor you can't go back!
hope it helped you
no
Dialga, Uxie, Mesprit, Azelf, and probly Arceas.
darkrai arceas (with plate)
hall of oragin
Arceas has to be caught in Pokemon diamond, pearl, or platinum, then traded to Soul-Silver and HeartGold.
Sorry no way to. Trade with diamond or pearl
Sadly, you can't get Arceus in HeartGold or SoulSilver. The only way to have it in HG/SS is to trade it from either Diamond, Pearl or Platinum.
get an action replay, get Pokemon modifier and full pokedex cheats, then find arceas!
in my view i would have to say arceas (with plate) and dark rai
in the national pokedex: arceas in the regular pokedex: dialga
the best way to get arceas in Pokemon diamond might be hard for you but i bet you'll think it was worth it! i have all the Pokemon on earth and arceas might have been the second hardest to get you have to get 3 dialga's and 3palkia's then put all of them in your party then they'll morph together then somehow they turn into one arceas!! i was as surprised you are!!! it may sound impossible but i speak the truth!!!!You can also you action replay which is a lot easier FROM FPM
the god of all Pokemon in diamond is........ (enter dramatic music here) ARCEAS!!!!!!!! (luckily it's not ur face!!!!!!!!!!!!)