Fire Emblem: The Sacred Stones Cheats

Use the Control Enemy glitch to have a monster with a flashing green "spoils" item in its inventory take the item you want restored from Supply. After making sure that your item is on the bottom of the list and is flashing green as if it were spoils, kill that monster. The monster will drop your item, however it will be totally new.
This trick can also be used on gorgon eggs, but the first item on the list will dissapear, and you must trade with them again after they hatch to regain the item. This glitch can even restore the Dragonstone.

In any free map that has damage tiles, kill every monster or unit except for one. Then, position a few of your units alongside the damage tiles, and remove their equipment, either by discarding it, or trading it to somebody else. If it works, the game's Enemy Ai will move the last unit on top of the damage tile. It will then proceed to attack any units it can, until it dies from the damage received by the damage tile.

Once the creature dies, the glitch activates. Even though there's no enemies left on the map, the game doesn't recognize the last monster as "dead", and the match continues until you either Suspend and Restart, or Retreat from the fight.

If this occours during the actual story mode, as opposed to a Monster Map, the current chapter will become unbeatable, requiring you to restart the chapter.