>>27235852>Kanto gets you a much higher actually because the trainers and wild pokemon scale with you to the point where they can safely make late game trainers level 50+ as opposed to Johto's 40.GSC/HGSS Kanto's NPC trainers have Pokemon in the lv35-40 area, and there aren't a ton of them despite Kanto being a whole second region. It's pretty bad when you start outleveling your opponents despite not grinding a single extra battle.
Postgame is something to do for extended periods of time after beating the main story, like the battle facilities in various games since Crystal. They impose rules like flat levels and Set Battle mode to ramp up the difficulty. GSC/HGSS Kanto is very much part of the main game, with the climax at beating Trainer Red. It just happens to be a second climax after the first one being the mid-game Pokemon League.
You're just pulling my leg here, dude. You can't possibly *actually* believe gen 2's single player campaign ends at Lance.