>>15685337He has an implied connection to Mewtwo, and everyone likes him because of his dialogue, where he admits that his typing of choice sucks but it doesn't phaze him the tiniest bit.
To couple that he uses defensive pokemon, which are terrible if they have as weak of a defensive typing as ice type.
Basically he's being stubborn and defying normality to challenge himself.
Besides, look at his design, he looks fucking badass.