The "Griseous-Orb" is found in "TurnBack-Cave". It is item to be held by Giritina. It powers up ghost and dragon type moves and turns giritina into origin form(e).
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The Griseous Orb is only available in Pokemon Platinum.
The griseous orb cannot be gotten in diamond. it's a platinum exclusive.
if you have action replay you will get to pick a pokemon so groudon is a hard pokemon you need the red orb for groudon on pokemon soul silver version or pokemon heart gold version but use action replay on pokemon pearl,diamond,platinum
catch it in spear pillar w/ the adamant orb. Dialga appears at Level 70
You go to the Battle Frontier and use B. P. and buy it at a counter.