You can download it in http://www.romsite.net/?q=pokemon+Mystery+Dungeon&system=1
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You could get a Rom for one of the Pokemon mystery dungeon games and then use visual boy advance to play it.
Download vituralboy advance and download pkm emerald rom
You can get it from Romhacking.net. See related link.
visual boy advance is the wrong emulator go to coolrom.com and download a dslite emulator
First download Visual Boy Advance for mac,( it will let you play the game) then type in Pokemon Emerald Rom in google, and download it from coolrom.com