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when i was younger i always thought of myself as a "steel type" trainer, with the TCG, in-game teams, favorite pokemon, everything steel typed! then around black and white it slowly started burning in the back of my mind that maybe i like the grass type even more. anyway when you're an edgy thing this could rub you as a lame move so i would really dig the idea of:
A teenage trainer with some experience and a strong steel type team, slowly realizing in the middle of his road to become a steel gym leader that maybe that's not what he wants the most. An identity crisis of sorts. He freaks out because he enjoys more battling casually with grass type pokemon that winning competively with steel types.
If the types remain steel and grass the transition would be with his main bro being Ferrothorn for example. You could make it a short (animated or live action).
you could even make a ferroseed the weakest of his team of 6 steel types at the beginning of the story and then at the end after realizing he stuck by him because of his grass second typing he would battle with an awesome ferrothorn as the strongest of his grass team.