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.
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.
Wailmer evolves into Wailord at level 40.
Wailmer evolves into Wailord on Lvl. 40
Wailmer evolves at Level 40.
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.
get a wailmer level 40
wailmer evolves at level 40. im positive.at least in emerald it does.
The Pokemon Wailmer evolves into Wailord at level 40 on Pokemon Black.
Evolve a wailmer at level 40.
Wailmer evolves in Wailord at level 40. No special events or items are needed, just level it up to level 40. For more information, visit: http://www.serebii.net/pokedex-dp/320.shtml Wailemer evolves at level 40 Wailmer evolves at lv 40 so use a super rod in battle area to find one at lv 40! The Pokémon Wailmer evolves into Wailord at level 40. Both are water type Pokémon. Wailmer's abilities are Water Veil and Oblivious. It evloves at 40
Level 40
Just train a wailmer to level 40.
Wailmer evolves into Wailord at level 40.
Wailmer evolves into Wailord on Lvl. 40
Wailmer evolves at Lv. 40 into Wailord
Wailmer evolves at Level 40.