Portable Console recommendations?

Hello, my fellow gamers!

I need your expertise on this one. I am a fellow rookie gamer myself and hope to stay that way lol. I game to relax and enjoy the moment, but to the point. I keep seeing these portable game consoles with already preloaded retro games. Which has gotten my eye on it. I still have my Gameboy, but not a lot of games because I came from a pretty low-income environment. Now, as an adult, I’m very curious about investing in one of these portable consoles. I’m interested in Super Mario, Kirby, Sonic, and especially Pokémon games to feel the nostalgia. I was wondering which one would be good for me, where it has a decent display and I don’t have to be downloading all these games. I’m hoping it comes already preloaded. I would love to hear your recommendations!