>>54498692Pokemons in the pokemon world are basically superpowered animals, and no single species is exactly like the other. Imagine trying to tame several different types of birds, canines, fishes, homo-sapienlike humanoids and more, all at the same time, while trying to win fights and not get yourself killed.
Pokemon protagonists are innate born prodigies. This is also why pokemon gyms exist in the first place, these are training centers sponsored by the league for type specialists that know how to train certain types of pokemon. You wouldn't feed a Fairy type with the same food or treatment you would with a Poison type. People that manage to pull through with all this juggling from taking care of different type pokemon become powerful trainers, hence why the champions get so much street cred.