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It would be pretty rad if they added a 4th starter to mix the game up a bit. A rock pop starter would be neat, but I know that's not going to happen.
He is probably going to be given to you soon after the start of the game. First city or after first gym. Maybe later in the game, but he will be given to you, in the way lots of people have been equating him to Eevee in red and blue.