If you want something pocketable, look into what Anbernic and Retroid are doing. They have, for example, OG Gameboy sized consoles with enough power to emulate

If you want something pocketable, look into what Anbernic and Retroid are doing. They have, for example, OG Gameboy sized consoles with enough power to emulate everyting up to about PS1/Gamecube: https://anbernic.com/products/rg35xx https://anbernic.com/products/rg35xx