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You wake up a Pokémon, in the animated world of Pokémon. You can be any Pokémon you want, and you can become as powerful as your species is able, but you're only able to learn the moves that come with leveling up naturally or via breeding (TMs and HMs do not exist, and leveling is more akin to simply growing older and more experienced).
You are also subject to trainers who might want to capture you. Unless you isolate yourself and train in private, you'll likely be attacked every other day by some enterprising young trainer seeking to improve his team.
What Pokémon are you and how do you live your life?