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I always was fond of Starly line. They were helpful in my Pearl game :). But there's a chance Mamepato will probably change it if they are as good in BW.
If I were to pick a Pokémon to have in real-life, I would choose a Pikachu. They are electric so they are bound to be useful and help around. I would also want a Rankurusu since they look so huggable and cute to have around.