You cannot obtain Unova Pokemon in Platinum. But, if you know how to code, it is possible to add Black and White Pokemon into your PokeDex, as well as X and Y.
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You can find Joltik in Chargestone Cave, but you can't actually find a Galvantula in the wild.
breed an electabuzz if you want an elekid in Pokemon platinum
You can't find Vibrava on Pokémon Platinum
starter Pokemon
where can i find the second gym in Pokemon platinum