In some amount of fairness on this point, Bakugan and Dragon Ball aren't really series where the protagonists are goal-oriented like Ash is. At least in Bakugans case (the originals btw, not Battle Planet).
Dan Kuso never really aimed to become the "best brawler" or anything but rather he became the best in the process of taking on all the enemies the series presented to him. That and all of the huge power ups the characters received that even surpasses Goku in the number of forms they take (haha). And even when reaching a new level, there was always a new enemy afterwards that was just as or even stronger, which cemented another new power up in order to one-up it.
On top of that, Bakugan's anime for the most part wasn't about simply getting better at the game, but defeating the enemies that came to cause chaos.
In case of OG Bakugan, Dan did aspire to be the best Brawler and there was a ranking system. The main purpose of the game was always to be the best as there was a ranking system. But then, Masquerade ended up coming in causing chaos.
It just coincidentally turned out, all the bad people except Shun, took up the top few ranks. This is why, it felt like Dan's rank simply advanced in the process of taking on all the enemies. If Masquerade hadn't recruited Klaus, Chan Lee etc, they would've been good people who Dan would've aspired to defeat to get up the ranks.
As for Dragon Ball, Goku has always aspired to be the strongest fighter in the (Planet, world, universe, multiverse etc), the scope of which has extended with the introduction of new characters. I definitely agree with the point about the Dragon Ball format, how Goku keeps reaching new heights but new enemies coming in who one up that new form or level of power Goku attained. But despite that, it still feels like Goku accomplished something concrete or relatively close to his ever-expanding dream.
Goku went from being a little boy weaker than Humans like Roshi, to the strongest mortal in his Universe at one point. This is some immense growth. Similarly, we see Dan go from being an average Brawler to one of the best in the world.
Ash on the other hand, has not experienced even half the level of success and growth compared to them. Ash doesn't have to be the strongest trainer in the world. But even if he's an elite four-tier trainer, that would still be a very big deal.