We're sure that some of you will be buying Pokémon Platinum
(whenever it ends up coming out here) just for this thing, so here's a nice clear picture of it. This is the new form of Giratina, Platinum's
cover Pokeman. Dengeki
labels it the "Origin" form, and it's pretty clear that this is some kind of larval stage in the Ghost/Dragon Legendary Pokémon's development, with spikes sticking out where its legs go.
The screen shown in the CoroCoro scan, with the male trainer's new jacket
, is also available in higher quality at the link, along with another screen featuring some mysterious shadow thing.