The 6th generation of portable game consoles, which is another Nintendo-dominated landscape, quite like the generation before it. Almost universally considered as having began in 2001 with the release of the Game Boy Advance, ending anywhere between 2004 with the release of the DS Lite and PSP, and 2008 with the discontinuation of the last dedicated Game Boy Advance. Even though the trend of Nintendo supremacy continued unabated, the 6th generation has quite the sweet variety of EOPs, with some significant contributions even coming from Nintendo's competitors. Despite not being so flush with EOPs like in the 6th generation of home consoles, this comes as no surprise as portable systems usually “lag behind” the home consoles by a generation. Thus, the “EOP explosion” of generation 6 will be found in generation 7 of the portables…

There are several projects in the works

It’s unknown if this was actually ported to the device, but technical work is documented on elinux.

https://elinux.org/Pixter

See Game Park GP32.

See Nintendo Game Boy Advance.

See Nintendo Pokémon Mini.

See Nokia N-Gage.

See Tapwave Zodiac.