By gaining EXP points. Wailmer will evolve at level 40 and the only way you'll get there is by either battling with it, using EXP share or putting it first in your party and then switching out straight away.
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you evolve it from wailmer at lvl 40 the easiest way to evolve it is to catch a wailmer with a super rod at mossdeep city
No stones make Wailmer evolve. It evolves at level 40
Wailmer evolves at Level 40.
Wailmer does not need a water stone to evolve, it evolves at level 40 into Wailord.
you can get your wailmer to evolve by:1.train it to level 40 2.trade it to a friend then trade back.(you catch wailmer by surfing around Undella Bay)