the weakest form of punctuation is

wah wah i dont need no wah wah

How bland is Whismur? bland. not even worth commenting on really
When people talk about Pokémon, they aren't talking about Whismur. It is outside the realm of consideration, though we are reminded of him from time to time, when it stands directly infront of us and we're bored enough to realize its there. Those times are very infrequent.
According to da Pokédex: "Whismur can become so startled by the sound of its own crying that it will continue to cry until finally falling asleep from exhaustion." ...so its totally useless. 
Is that why we don't remember it? 
It also looks like a sock, which isn't very memorable. Save your Pokéballs children.