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Imagine how sweaty and stinky Valerie must be from wearing those layers of clothing involved in her elaborate costume all the time everywhere she goes. And we know she has to be pretty muscular too, the game even comments on this.
Sweaty stinky and muscular, and probably doesn't shave either. All natural, just like a pokemon would be. Just imagine burying your face between her legs after she comes home from a long day of gym leader battles and training.