Whismer will evolve at level twenty because i just evolved him this very minute. ^_^
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I'm not sure, but in Ruby version, which takes place in the same region as Emerald, Whismur evolves at Lvl. 20. Hope this helps :)
Catch a whismur and evolve it twice, once into loudred and again into exploud.
1) train whismur to a good level 2) go on my pokemon 3) under whismur it will say evolve me 4) click evolve 5) you have evolved whismur into loudred
To evolve Whismur, you have to get him to level 20. He then evolves into his next form at level 40.
Whismur evolves at level 20 into Loudred lol this is awesome thanks ya!