A new flash cart was just released for the Pokemon Mini handheld console. The solution costs around $100 depending on options: http://dittomini.com/
This device allows for both original and homebrew games, as well as the upcoming ability to back up and restore savegame files! More information can be found on their main website (linked above) and the forums: http://www.pokemon-mini.net/forum/viewtopic.php?p=6467#p6467
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