Fire Emblem Cheats

Completion bonuses:
Finish the game to the hard difficulty setting, Hector mode; and the "Sound Test", "Movie Gallery", and "Tactician Rating: options.

Hector hard mode:
Finish the game in Hector's normal mode.

Get Roy:
To get roy you must beat Eliwoods Hard mode 10 times.
User Cheat by sawyerseals  

Get Marth:
You can also get Marth by doing Hectors Hard mode 20 times, you must get Roy first.
User Cheat by sawyerseals

Hidden Characters:
Harken: At the level where it snows, after it starts to snow the 2nd time, if you have not killed more than 3 upgraded enemies (Sniper, Druid, etc.) Harken (a Hero) will appear in the upper left hand corner. Talk to him with Eliwood, Lowen, or Marcus and he will join your party.
Canas: Canas specializes in magic like Flux and Luna, the opposite of Erk\'s abilities. As you progress through the game you will eventually be asked to \"Accept this side Quest?\" When you are asked for the first time, select yes. You will be taken to a level that requires you to defeat pirates in order to get passage to an island. When you begin that level head on straight up. Visit the first or second house. Talk to Canas, he\'ll join your group.
Dart: Dart is in the same level that you\'ll find Canas. DO NOT fight him or his capitan, just talk to the capitan. Dart will join your group within the next few levels. You may be asked to accept another side quest. If so select yes.
Legalt: Legalt is a thief like Matthew. In chapter 19: Dragon\'s Gate, you will notice a thief in a red coat running around. He\'ll try to open two chests on the castle\'s right side, and will run back to where he first appeared and disappear. Use Lyn or Eliwood to confront him. Talk to him and he will join your group.
User Cheat by N***

Control Enemy Units:
Here\'s what ya gotta do. Have a mine set out on a spot where an early moving enemy would move. When the enemy steps on it, shut the game off during the explosion. Then turn it back on, the mine will finish blowing up and any enemy units that hadn't moved will be in your control for ONE turn.
User Cheat by N***

Unlockable: Ocean Seal:
In the Nabata Desert Level (Living Legend), Use a thief or Canas and move him to the area near the place where you first see Hawkeye. Move him to about 4 squares left of the bottom right of the screen and you will find an Ocean Seal. This seal can change a pirate (Dart) to a Berserker. If you train Dart to level 20 and then use the Ocean Seal on him, than he will become significantly more powerful than Hawkeye.
User Cheat by N***

Character upgrades:
REMEMBER: Your character cannot be upgraded unless they are at level 10 or higher.

Archer to Sniper: Orion's Bolt/Earth Seal
Nomad to Nomadic Trooper: Orion's Bolt/Earth Seal
Knight to General: Knight's Crest/Earth Seal
Calavier to Paladin: .Knight's Crest/Earth Seal
Wyvern Rider to Wyvern Lord: Elysian Whip/Earth Seal
Peg. Knight to Falco Knight: Elysian Whip/Earth Seal
Pirate to Berserker: Conquer's Emblem
Troubeder to Valkrie: .Guilding Ring/Earth Seal
Mage to Sage: .Guilding Ring/Earth Seal
Monk or Cleric to Bishop: .Guilding Ring/Earth Seal
Shaman to Druid: Guilding Ring/Earth Seal
Mercenary to Hero: Hero's Seal/Earth Seal
Myrmidon to Sword Master: Hero's Seal/Earth Seal
Fighter to Warrior: .Hero's Seal/Earth Seal
Eliwood to Knight Lord: Upgraded by Athos
Lyn to Blade Lord: Heaven's Seal
Hector to Great Lord: Heaven's Seal
Theif to Assaian: Fell Contract
Bard or Dancer: Cannot be upgraded
Archsage: Cannot be upgraded

Getting extra characters:
Your enemy works for a house or organization. It will say the name of the characters or the group they are working for. if it shows a face instead of a symbol you can almost always get that unit with green units.

Dropping Mines:
When you drop a mine, put a weak guy (such as bartre, matthew, or guy) behind it and draw an enemy to it. When the enemy steps on the mine and takes the damage, turn off the gameboy advance. turn it back on and \"Resume Chapter\".Then you can use the rest of the opponents unused characters. Good for those hard levels, so you can discard all of the enemies weapons.
User Cheat by cheesepoof453

Fighting the Last Boss:
when fighting the last boss the dragon use athos only to attack and have someone heal him every turn,if your person healing athos gets hurt give him some elxers and have him use them.  If the people on the tower attack use your strongest people to rescue the weaker ones or try your best to stay out of their attack range.
User Cheat by Kld456KC

BEST STRATEGY TO BEAT THE LAST BOSS:
To beat the dragon, max out Hector to lvl 40(changing class at lvl 20 and lvling him to lvl 20 as a great lord)  Also, try getting Elliwood to as high lvl as you can, I recommend at least lvl 35 and up, so that he survives the dragon.  With Athos, the maxed out Hector, and Elliwood, attack the dragon.  Use the fortify that Renault has, and if that isnt enough, than heal them with physic using Pent, and Prisilla with recover (rescue her with a paladin or cavalier so that she doesn't die from the dragon.  Repeat this process over and over again until the dragon dies.  Another useful tool is bolting and the hammerine staff(the thing that fixes weapons).  Save the bolting for the last chapter and also the hammerine staff.  Give the bolting to Athos and, before anybody approaches within attacking range, keep striking the dragon with bolting until you only have 1 left.  Then use the hammerine staff and fix it.  Repeat this process over and over again until u tak out at least 20 - 30 damage.(NOTE:This strategy takes a long time and many turns, and you won\'t even need it if you follow my requirements of Hector and Eliwood\'s levels.  I only do it because its entertaining to see the dragon get hit by bolting and being so helpless.) 
User Cheat by mh123456