Catching Gulpin can be done in multiple ways, but the simplest is this--once you've obtained the National Pokedex, go to the Pastoria Marsh Safari Game. You can randomly skit around the park, or use the binoculars. (I used the binoculars and didn't see anything, but when I just randomly walked around, I found two!!)
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It is possible to get the Pokemon Gulpin in Pokemon Platinum version by going to the Great Marsh. Gulpin is a poison type of Pokemon.
Gulpin evolves into Swaloti at level 26 in Pokemon emerald
Gulpin evolves into Swalot at LV.26
Gulpin is #316 in the national pokedex, and it is a Poison type Pokemon.
Unfortunatly,Gulpin cannot learn surf unless you use a gameshark to force it on it