Ah, planning my team is probably my favorite part of starting a new game. I always use a Fire-type, Water-type, Grass-type, Electric-type, a flyer, and one more with a type that's not represented in my team. I like to have a diverse-looking team - I don't like to have Pokemon that are the same color, shape, and I like to have different sizes represented. I also don't like reusing Pokemon I've used in the past couple years.
That being said, here's my plan:
Serperior (Draper/M): I always use my starter. I used Emboar in White, so I'll use the awesome regal snake this time around.
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Arcanine (Tiger/M): I always wanted to use this classic Fire-type, but never did. I'm really excited about having this lovable beast on my team.
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Starmie (Mimi): This is another Gen 1 Pokemon that I always loved, but never used. I was always lured by the other cool Gen 1 Water-types like Poliwrath and Gyarados. It was a toss up between this and Golduck, which I decided I'd use for a Pearl run instead. So, now it's Starmie's turn to bat. The Water/Psychic combo is a bonus.
Galvantula (Chloe/F): This was a hard choice. I had recently used Electivire, Jolteon, Zebstrika and Ampharos. I wasn't a huge fan of the other options, but I finally settled on Galvantula. I'm pleased with my choice now. Seems like a cool Pokemon with an interesting Electric/Bug combo. Plus I think it's 4-inch prevo is adorable.
Unfezant (Gale/M): I used Braviary in White, and I originally wanted to use Flygon this time. But it bothered me that the coloring/shape was too close to Serperior. Plus, I like using the common bird at some point each generation, and I love the male's design.
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Lucario (Luke/M): This guy is the definition of cool. Loved him in the animated trailer, and I've wanted to try him out since last gen. I love that he's available early in the game. It wasn't an easy choice, though. I also considered Steelix (ruled out since I have another snake) and Grumpig (ruled out because Starmie's part Psychic).
Hopefully I don't sound too OCD.