you have to get to the top of mount coronet and catch giratina in the reverse world then go to sunny shore city
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beat the fifth gem leader than you get the Hm surf
After capturing Giratina, go talk to prof. Rowan in Sand Gem Town.
The eighth gym leader of Sinnoh, Volkner, returns to battle you again in Platinum after you beat the Elite Four. When you get to battle frontier, you and your rival have a double battle against Volkner and Flint, an Elite Four member.
sand gem
how to get a togepi in Pokemon platinum