I don't know really if it's good in emerald or not...But i tried using it in Ruby (Nuzlocke Run) and i think i would lose a pokemon to may's Combusken(all my team expect gulpin have a type-disadvantage) Here is where Gulpin shined and defeated Combusken
Gulpin learns a powerfull move early (Sludge) But i suggest you try using it yourself few times to see if you like it or not.
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Gulpin evolves into Swaloti at level 26 in Pokemon emerald
You can find one on Route 110. It has a 15% chance of appearing.
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 is #316 in the national pokedex, and it is a Poison type Pokemon.