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Kanto is only available in Fire Red/Leaf Green. They're the exact same games as the original Red/Blue versions, except with graphic improvments, and a sort-of different storyline. Personally, I love this game. I suggest you get it.
However, if you want to be able to visit Kanto and Johto, you...
Porygon2 is not useless at all. His stats aren't bad.
As for Porygon3, if they do that, I would love it. As it is, I love to train Porygon2 because he's good in battle. A Porygon3 could be incredible.