Originally Posted by
UltraSound
One thing I'm like 99% sure they won't do in the new game but hopefully, maybe, in the future;
You start your adventure and you can go anywhere, and the area difficulty would change depending on your process.
If you went to Route 1 first, you'd encounter Rattata's level 2-5, but if you went there last, you'd find level 50 Raticates.
You could challenge the gyms in whatever order you like. If you went to Gym X first, you'd have to fight a Pidgey and a Pidgeotto around level 10-20, but if it was the last gym you're challenging you'd be against like Altaria, Pidgeot and Talonflame etc. leveled 50-70.