Screamapillar on 15 July 2013
Well, they released Mario Power Tennis for Wii in 2008 under the New Play Control series, just like Pikmin and Metroid Prime.
I don't know if that counts, per se.
I think Mario sports games are better suited for portable play. Nintendo probably figured that since Wii Sports and Wii Fit were selling so well throughout all of Wii's lifespan, and since they couldn't be done on portables, that they might not have wanted to release motion-controlled Mario sports games to compete with the motion-controlled Wii series.
So, basically, just my roundabout way of saying that I assume Nintendo consciously decided no Mario Sports titles for Wii (other than soccer and baseball) in order to not cannibalize their own Wii Sports and Wii Fit games.
The Screamapillar is easily identified by its constant screaming—it even screams in its sleep. The Screamapillar is the favorite food of everything, is sexually attracted to fire, and needs constant reassurance or it will die.
