>>55230859It depends on your playstyle. If you just use good pokemon, keep a tight team of 3 or 4, and rarely if ever swap them out of your party, you won't see this. If you are a more dynamic player, like running 6 Pokemon, and even occasionally swapping Pokemon out, you'll be severely underlevelled for the elite 4.
Kanto is a lost cause though. Its always going to be so easy because its weaker than the e4