There is no "worst" starter, it's all about your personal preference. They are all good starters. The most challenging is turtwig.
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starter Pokemon
You can get another starter if you get all the sinnoh pokemon. Proffeser rowan will ofer a johto starter.
pick it as your starter
you cant in platinum but you could trade from Diamond and Pearl or another Platinum.
It depends on what type you like. I'd say the worst pokemon at the beginning is turtwig but he is pretty good when he evolves into torterra. Chimchar is good and when he evolves into infernape he is a beast. So personally the worst starter pokemon is piplup.