To get an sharp beak you need captire Fearows/Doduos/Dodrios. There is an about 5% chance that the Pokémon will be holding the item so Good Luck.
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you found one on a wild doduo,you have a 5% chance
It highers flying type moves
You can only get it from certain wild Pokemon which are Fearow, Doduo, and Dodrio which have a 5% chance of having the item. So either catch them and see if they have one or use a Pokemon with thief to steal a item from the opponent. The other method is trading a Pokemon with the sharp beak from HeartGold or SoulSilver which you get it in that game from Monica of Monday.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.