No. That's what makes ash, ash. The same way Goku always has someone stronger than him to keep interest. Ash's ultimate goal, besides to catch em all, is to beat a league. If he beats it...then what? :O
This guy knows what's up. Generally speaking, in all animes/TV shows that are meant to last forever (because they print money), they will never achieve that ultimate goal, because.... that's the end.