Whismur

The cry of a Whismur is over 100 decibels. If you’re close to a Whismur when it lets out a cry, you’ll be stuck with an all-day headache.

Normally, WHISMUR’s voice is very quiet - it is barely audible even if one is paying close attention. However, if this POKéMON senses danger, it starts crying at an earsplitting volume.