Since I have recently aquired a GBA SP, I am contemplating using the fan translation for mother 3 to play it on my GBA SP.  My checklist is as follows:

Find a website that sells Mother 3 -> Done, I am buying from ebay.

Find the ROM of the game and the fan translation -> Finding the ROM shouldn't be a problem.  Already know where to get the translation.

Patch the ROM -> Won't download the ROM until I own the game.

Put patched ROM on EZflash cart and play

The parts that I need help on are legit sites that sell the EZflash carts and knowing which one to get.  I would appreciate help from anyone who has done this.  I would recommend not posting any links here to sites that sell flash carts because I know how sensitive the moderators are on anything that may be used for pirating.  Emailing me may be a better option.

You won't be able to play the fantranslated version on your SP. You can only play that version on a PC.

This link on the mother 3 fan translation's site say's otherwise. It give the steps necessary to do so: http://forum.starmen.net/forum/Games/Mother3FanTranslation/47933

Sorry.  My apoligies.

I may have a site, but it'll be awhile before I find it.