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The first one that comes to mind is Croagunk/Toxicroak. At first, they never appealed to me; despite their unique type combination, I always thought they looked sort of stupid and ugly, and their poses before Gen 6 were really boring.
But then Gen 6 changed their poses, giving them more personality, and that little change was enough to convince me to give them a chance. So I caught a Croagunk on Route 7 and tried him out in battle, and he ended up becoming a core part of my team because I liked him so much. Now, Toxicroak is probably one of my favorite Fighting-types, as well as one of my favorite Poison-types.