you find them on route 26 or 27.But if u go 2 route 26 u cant find doduo at night in hg.
u can also find dodrio on route 26.
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If you want to get a doduo in Pokemon platinum there are two ways: 1.you can catch it in another game (Fire red leaf green etc.) then transfer it to platinum (look in instructions on how to transfer Pokemon.) 2.you can talk to dawns sister in her house she will say that there's alot of (a type of Pokemon) at a sertain rout then if you go there youcan catch it but these inly last a single day so act fast. problems:she might not say doduo just keep talking to her until she does.
Heart scales are only in Pokemon emerald, ruby and sapphire but you can get one if you trade a heart scale from ruby or emerald or sapphire to leafgreen then take it but it will not do anything in the game.
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.
U can only get heart scales in the pokeballs in the wild. Or you can made a Pokemon hold a heart scale at trade from a different game.
You can find it in Pokemon Platinum, Pokemon Crystal, Pokemon HeartGold, and Pokemon SoulSilver.