Basically its a shiny gulpin, shiny Pokemon have different colors from there original colors here's an example: charizard is normally orange but its shiny color is black.
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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 Swalot at LV.26
Gulpin evolves into Swaloti at level 26 in Pokemon emerald
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