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Everyone tends to forget how the main characters are always a prodigy, most people in the pokemon world just stay with their main and don't go to the wilds to capture more, they probably can't even tell their stats.
And pokemon ARE dangerous, that's the first thing Oak tells you in the first game, and the main reason Ghetsis thought his plan was a good idea, think about it, most bad guys in the pokemon world are going to give up when you defeat their pokemon, they wont stand a chance, even against one Magikarp.