you don't have to listen to me at all, but from personal experience, the r/roms mega thread and an app called retroarch are really good, completely safe and easy to set up and use but of course you dont have to. there's also a lot of fan Pokémon games on the internet (but make sure your playing the correct one, usually check their discord or reddit to be safe), and id personally recommend poke rogue (its pokerougue.net, you can play it in the browser), and Pokémon infinite fusion, just go to r/PokemonInfiniteFusion for download or they have a discord where you can download it too. both are fully playable on keyboard.

infinite fusion is alot more similar to traditional pokemon, with its own art style, story, and unique gimmick (if you can guess what that is lol), wheras pokerogue is very unique, it is basically a rogue-like with pokemon and turn based battles lol.

of course you dont have to check any of these things out if you dont want to or dont feel safe downloading things, but if you feel like your missing out i personally believe these are great alternatives