Go to the lake of rage and catch or deafeat red gyarados and you will automatacly get the dragon scale
^ That's a Red Scale. Trade it to Mr. Pokemon for the exp. share. The Dragon Scale can be found in Blackthorn City after defeating Claire.
Capture a dragon type pokémon or receive the drantini in that cave near the dragon gym.
You find it in Mt. Mortar in the Johto region. You need to have surf and waterfall available and you find it in the area where a school boy has a level 30-40 Seadra.
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Mt. Mortar or you can buy it in the Pokeatholon Dome
you have to catch a dragon Pokemon holding a dragon scale
dragon denyou can find dratini by surfing in dragon's den in blackthorn city. (the city where you get the eighth gym badge)
Heart Scales can be purchased in the Pokeathlon shop for 1000P
Heart scales can typically be found underground by using the Explorer Kit.