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I dunno. The Pokemon just grows on me.
Back in early 5th gen, I missed out on the Zoroark/Zorua event, so some guy on /vp/ gladly gave me a lvl.1 Zorua. I didn't want it because I liked it. I just wanted to own one since I missed the events.
Trained him up and became part of my ingame team. Pretty powerful, so I used him a lot. Eventually, he became the first 5th gen Pokemon I trained up to level 100.
So he just grew on me over the times I've used him, and I guess that's how he became my favourite. But, for the record, I have more than one bro.