Rainbow Dragon, known as Ultimate Gem God - Rainbow Dragon in the Japanese version, is a character version of the card, "Rainbow Dragon".
Rainbow Dragon appears in Yu-Gi-Oh! World Championship 2008. By beating it the first time, Jesse Anderson is unlocked.
In World Championship 2008, Rainbow Dragon uses a "Crystal Beast" Deck titled "Over the Rainbow". It is named after the attack it uses in the Yu-Gi-Oh! GX series.
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