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Which game do you want to emulate? If you're talking about fe7 (localized as just Fire Emblem in the west), you're gonna need a ROM which I can't link here but I can PM to you if you need it, and an emulator. I recommend Mgba (https://mgba.io/) for GBA games.
In that case, you're gonna need a ROM, an emulator (https://www.zophar.net/snes/snes9x.html), a translation patch (https://forums.serenesforest.net/index.php?/topic/63676-fe4-translation-patch-open-beta-v7/#comments), and a patcher (https://www.marcrobledo.com/RomPatcher.js/). Theres different patches for different versions of the game, but the readme in the translation patch tells you which patch to use for your file.