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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.

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13y ago

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