Try looking around route 32
Route 212 (Diamond/Pearl only)
Wooper will evolve at level 32.
Wooper is water and ground type, so a grass type should do it.
at the safari
The Great Marsh.
i think you have to evolve wooper go check on seribii.com rbygsc pokedex
wooper is in Ruin vally on Island Six
Wooper will evolve at Level 20.
in route 212 in pastoria city
wooper evolves at level 20 into quagsire..veronica
I'm not sure if it's possible to catch Wooper with a good rod, but you can find it in the tall grass in the Great Marsh, which is located in Pastoria City.
Route 212 (Diamond/Pearl only)
Wooper is a Water and Ground type pokemon.
Other bodies of water and by the water you can get a wooper
first you need to beat the Pokemon league in ever grand city when you do go to the safari zone if you see a new path go to the waterfall the surf around on water then you will meet a wooper
Wooper doesn't evolve in Pokemon crystal because quagsire(the Pokemon wooper evolves into)wasn't made yet then. Hope this helped!
Wooper will evolve at level 32.