Forgot to mention, check out Star Beasts if you want gen 1 Fakemon.

>>719659931
Don't touch the Retroid Pocket Classic, you do not need to spend that much money just for GBA, everything under 50 can do PS1 back minus Saturn and N64.
TrimUI Brick is solid as is the RG35XX-SP (Provided you do the button mod), RG34XX-SP (Provided you don't hate that it has sticks and a dumb top screen), and the RG34XX (It's literally just a GBA).

I played Super Mariomon on my RG34XX the whole way through and it was great.