15 throgh 50. Yes but a wailmer can also be found at Lv 75 any higher than that you can only find its evolution waillord
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You must evolve wailmer/surf and find one on route 129. There are few there. Wailmer will evolve at level 40.
In Dewford Town, you can use your super rod to catch a level 20 - 45 Wailmer. In Lilycove City, you can use your super rod to catch a level 25 - 45 Wailmer.
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.
If you are talking about Pokemon diamond you must go to the battle area and get a super rod from the fisherman standing next to the walkway. After you have that fish anywhere in the island and you are definitely gonna find a wailmer around lv 40. For Ruby, Sapphire, and Emerald, you can't catch a lv 40 wailmer, but you catch a wailmer at Mossdeep City using a super rod.
No, Wailmer can only be found on water routes by fishing or surfing.