You cannot change the language if you have the GBA cartridge. However, you could find a patched rom that was translated to English.
There are two Fire Emblem games released for the Nintendo DS. However, only one was released internationally, which is Fire Emblem: Shadow Dragon. The one that was not released outside of Japan is Fire Emblem: Shin Monshou no Nazo ~Hikari to Kage no Eiyuu~.
no, import or use a gba emulator
No, Fire Emblem Sealed Sword is Fire Emblem 6. Fire Emblem 7 is the prequel to Sealed Sword and are separate games.
there isn't any there are codebreaker codes find them at neoseeker.com
Talk to him with Lalum (Dancer) or Elphin (Bard) in Chapters 13 or 15
A sword
The GameBoy Advanced as the most Fire Emblem games. Fire Emblem: Fuuin no Tsurugi, Fire Emblem: Blazing Sword, and Fire Emblem Sacred Stones were all released for the Nintendo GameBoy Advanced.
Blade of Light
lke been had the sword ragnell
Google search "Gba Emulator" and click on a good one. download it and then Google Search "Fire Emblem Sealed Sword Rom" and download a good usa one. you can also get cheats for it. Search "Fire Emblem Sealed Sword Action Replay Cheats." and have fun with getting them. :)
http://cheats.ign.com/ob2/068/499/499430.html IGN website pertaining to Fire Emblem Cheats and Tips.