Paras is not in emerald so trade one from firered, leafgreen or xd gale of darkness.
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You can't you got to trade it from firered ore leafgreen :(
If one is looking to find images of Paras the Pokemon there are many online websites to do so. Bulbapedia is a great place to go for Paras images and information as well as Google Images.
Go to the Pastoria Marsh and look through the binoculars until you find Paras
Parasect: Evolve from Paras.
In Pokemon Platinum Paras (#046) can only be found in the Great Marsh. You have to look through the binoculars and see it in order to find one.