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Both generations of Pokémon games are very much a core J-RPG experience. The lacking of new, more complex mechanics such as natures and abilities in modern Pokémon games is made up for with gameplay that requires dedicated time and effort to reach into its deepest crevices. Starting with Ruby and Sapphire on the Game Boy Advance, Pokémon's gameplay has slowly morphed away from that original experience into something more streamlined for anyone with even just a casual interest in video games.
RBY and GSC, more than any other games in the series, give you the time and space to really get attached to your Pokémon and your individual story as a Pokémon trainer. GSC especially are much slower paced than modern Pokémon and expect you take the time to immerse yourself with a combination of daily events and tough-to-reach goals. It is simple enough for a child to pick up, but deep enough that you can spend hundreds of hours even after clearing the main story. That isn't even to mention the level of customizability that opens up when game versions are connected to each other for trading and breeding!
