I didn't like the Tepig line. The Fire/Fighting thing gets old after a while, and it's moves weren't really any fun either. Combine this with it's slowness, and you have a pokemon that's not really any fun. I chose it as my starter in black 2, and wound up trading to my cousin a few days later for his Leftovers. Even when I did have it on my team, it wound up stuck behind my Muk and Arcanine the whole time.
I also didn't really like Genesect. The thing looks awesome, sure, but like the Tepid line it lacked fun to use attacks. For example, having it's signature move be normal type until you find drives to change it was a pain, and being forced to waste your held item slot for it made it even worse. The thing wound up boxed before the bug gym.