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I'm also tired of seeing fics with kids who literally don't consider any career options besides going out into the wild and catching a bunch of pokemon. It's fun in the games, but it sadly gets stale in the fanfiction realm.
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Preeeetty much this. Sure, it's totally because of wish fulfillment or what-have-you, but quite a few of them don't really bring anything new to the table, sadly enough.
Besides. It's not a particularly practical job, and it feels like there's a lot of "BUT IT'S POKEMON SO IT'S AWESOME" logic that goes on when it comes to making decisions about characters in this franchise. (I know. That's vague. Pretty big umbrella, though. Ask Brutaka about my opinion concerning PMD fics.) But for reals, training is basically glorified camping with a side of occasional cockfighting. Awesome idea at first, but unless you're a survivalist, how much fun would it be after three months of foraging for food, sleeping on hard ground, going without wifi, and let's not even mention toilet options? It'd be awesome to see more kids who go through that thought process, do a massive NOPE, and then three-point turn right out of the professor's lab.
Or even better, start off training; realize, "oh my god I'm absolute **** at this"; and go home to get a degree in accounting.