The average level of your Pokemon when you beat the game tends to be around 65. The max level that you can reach is 100. Pokemon’s post-game content is tragically sparse, so once you beat the Elite Four, the top trainers in the world, your journey is pretty much done. If you want to reach Level 100 and patrol the world like a vengeful god, you still have a third of the game left after you squash the Elite bros and get told how great you are again.
The trainers who are around still attack you with obscene aggression, and you just have to squash them. When you run out of these tributes to your ego, you wander back and forth across the land, left with nothing but your thoughts, knocking out random wild Pokemon for the meager experience points that they give you. There is no one to relate to, and no one to share your feelings with. It’s why at the end of Pokemon Silver and Gold, you find Red, the character you played in Pokemon Red and Blue, just waiting at the top of a mountain. There is nothing else left for him except to kick the ass of every hiker who accidentally crosses his path.
Pokemon teaches you that, once you’re above everyone’s level, all you can deal is pain. Everything you do is the equivalent of dropping a rock from a high building onto the people walking below.