It’s literally because you are viewing the world through the eyes of some 10-11 year old most of the time or a 16-17 year old with virtually no responsibilities.
Shit isn’t all exciting travels People still struggle and have to work within the pokeverse. There are still wagies in the Pokeverse. Most adult trainers usually have some kind of job that doesn’t relate to Pokémon to actually support themselves. The few who don’t are usually Dragon type autists. If you are in the pokeverse you will almost guaranteed need to do some kind of labor or study.
For me, I’d work my ass off to become a top Pokémon breeder but god knows even that would be a tedium over time.
Crime still takes place and is honestly common place. In fact it might be less safe in the pokeverse just for the amount of Pokémon that do snatch up or lure away humans which are never seen again.