The stroies of Pokemon are all fictional and in most cases illogical or nonsense.
Once all but one of the plates have been collected, players will then need to return to the top of Mt Coronet, where their former-friend Volo will finally reveal his true colors.
This may also raise the user's Defense stat.
If you can, have someone tag along who can lull Giratina into the Sleep status.
How to get Giratina's Origin Forme In Pokémon Platinum, Giratina could change between two forms: Altered Forme and Origin Forme.
This may also leave the target with paralysis.