Ankoku no ryuu
In the Japanese version but not the English version.
The blue dragon is said to be a symbol of a leader in Japanese culture.
Rainbow Dark Dragon is a secret rare in Phantom Darkness.
Rainbow Neos is a fusion of Elemental Hero Neos, and either Rainbow Dragon, or Rainbow Dark Dragon.
A Dark Dragon Pokemon takes double damage from Fighting, Ice, Bug and Dragon moves.
ダークドラゴン (daaku doragon)
The Japanese word for Dragon is "Ryuu"
Doragonfurūtsu
ドラゴンストライキ
ryu no ha
Doragon iki
Kagami Ryū
'Kinzoku no ryuu'.
ginryu
ryu-ken
to say dragon in Japanese is 龍 and it is read ryuu hope this helps :)
Azaki