>>53349628Name me a replayable game.
Even a handful of what you'd call replayable games.
Just in Gen 1 alone you have ~130 monsters available to you in each game, and ~80 independent evolutionary lines in the games as a whole.
Each of these can be massively different from the rest. And can give you totally different experiences for it.
A gym leader like Misty can go from trivial to being very difficult easily. And this continues on throughout the game and each significant boss battle.
There are hardly any games out there that allow so much diversity of approach. Even most 'open world' games, like Fallout New Vegas, have far less diversity of actual gameplay. With most of the 'replayability' coming from just dialog choices rather than you enjoying any mechanical changes. Simulations like Paradox strategy games beat out Pokemon of course, however.