you need to have regirock, regice, and registeel
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You can only get Arceus by an Event.
Some of the event Pokemon can be found in toys r us on the event dates.
that was an event that is over but you can get there with action replay
The strongest Pokemon in Platinum is probably Arceus, to get Arceus, you need a mystery event, but that event is finished now. :( The second strongest Pokemon would probably have to be Giratina, or probably dialga or palkia.
use rotom event from Pokemon platinum ( i think )