Trade from D/P/Pl or hack using Codebreaker/ Action Replay
yes you can
There is no in-game way of getting Arceus in HG/SS.
yes.
Any time you have arceus in your HG/SS party and go to the ruins then the event will happen!
You cannot catch Palkia in HG/SS. To obtain Palkia u will need to get TRU Arceus to do the Arceus Event in the ruin of alph.
You cannot get it in-game; you have to trade it from D/P/Pt, or get it from an Arceus event for HG/SS.
if you give them to an arceus the arceus would change types, for example a flame plate would obviously make him a fire type! Plates also power up moves of their type.
First off, you do not catch Celebi in HG/SS. You must get it from an upcoming Nintendo Event or trade it. Second, you must get an Azure Flute from a Nintendo Event to get Arceus in Diamond. Third, the Unown have nothing to do with Celebi.
impossible cause the only level 80 ground type i know is arceus
You can send it from Pokemon Diamond Pearl or Platinum after obtaining it form an event, or use a cheat code.
That is impossible! You can get it from action replay on some older games like Platinum, Pearl and Diamond! Pokeaster.
trade over your wifi arceus to hg or ss and put it first in your party. Go to the ruins of alph and try to go into the building with people in it. the older man will take you into the ruins and then the event happens