First of all, you must have the national dex, and beat the Elite 4. Then, Fly to Snowpoint City and talk to the sailor there who will sail you to the Fight Area. Your friend will be there with this guy called Buck. After that, go to the top of the Fight Area and talk to the fisherman there. He gives you the Super Rod. Then, fish whilst Surfing on Route 230 and Wailmer has a 30% chance of appearing. They appear at levels 30-40 so be prepared.
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To catch wailmer in sapphire/emerald/ruby is to go to pacifladog town and fish with a good rod(go to mauville surf like you are going to fortree and talk to the 1st fisherman he will give you the good rod) or super rod (go to mossdeep and go to the space study thing but go down 1 flight of stairs and run north to a house and there will be a fisherman he will give you the super rod) it might appear soon or late depends hope i helped
You can find it but it's very hard to actually find it, so i'd say catch a Wailmer and train him until he evolves.
The Pokemon Wailmer evolves into Wailord at level 40 on Pokemon Black.
if you mean wailmer its almost everywhere
Use the Wailmer Pail on it and it will attack as a Sudowoodo.
you cant catch it in emerald