Brawly - I like him since he is so easy to defeat if you have a Combusken. Simply peck all of his Pokémon's eyes out and you'll have destroyed him without getting even one hit point worth of damage.
Flannery - I love Fire Types, so of course I love Flannery! <3<3<3
Sorry for having two, but they are my two favourites and it's hard to choose between the both of them.