first you have to battle maxie at the magma hideout (jagged pass) then go to slateport and watch aqua steal sub. Go to the aqua hideout (near the wailmers) and watch them run off with submarine. (dont forget to get master ball from hideout) now the wailmers are gone
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Wailmer evolves into Wailord at level 40.
Evolve a Wailmer (Level 40)
Yes, you can. Though it's much easier and faster to catch a Wailmer by fishing.
You must evolve wailmer/surf and find one on route 129. There are few there. Wailmer will evolve at level 40.
You can capture wailmer in ruby, sapphire and emerald on most routes where water is you can find either by using a rod or by using surf.