"Ultimate Crystal" (Japanese: (きゅう) (きょく) (ほう) (ぎょく) (しん) Kyūkyoku Hōgyokushin lit. "Ultimate Gem God") is a small archetype of Dragon monsters with 4000 ATK and 0 DEF used by Jesse Anderson in the Yu-Gi-Oh! GX anime that support the "Crystal Beast" archetype. It is also a sub-archetype of the "Crystal" archetype. All members of this archetype are LIGHT monsters, except for the DARK "Rainbow Dark Dragon".

Members of this archetype in languages outside Japanese do not have the words "Ultimate Crystal" in their names, but instead include archetype conditions specifying that they are members. Prior to the release of Legendary Duelists: Ancient Millennium, all support cards for this archetype instead named "Rainbow Dragon" and "Rainbow Dark Dragon" specifically in their text. With the release of the Fusion Monster "Rainbow Overdragon", all members and support for this archetype received errata to make this archetype clear (except for "Rainbow Path", but since it only affects monsters in the Main Deck, it cannot search "Rainbow Overdragon").

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... more about "Ultimate Crystal"
Cristal Ultime +
Ultimativer Kristall +
Cristallo Finale +
<<ruby class="rubytext ruby-ja" lang="ja"><rb>究</rb><rp> (</rp><rt>きゅう</rt><rp>) </rp></ruby><ruby class="rubytext ruby-ja" lang="ja"><rb>極</rb><rp> (</rp><rt>きょく</rt><rp>) </rp></ruby><ruby class="rubytext ruby-ja" lang="ja"><rb>宝</rb><rp> (</rp><rt>ほう</rt><rp>) </rp></ruby><ruby class="rubytext ruby-ja" lang="ja"><rb>玉</rb><rp> (</rp><rt>ぎょく</rt><rp>) </rp></ruby><ruby class="rubytext ruby-ja" lang="ja"><rb>神</rb><rp> (</rp><rt>しん</rt><rp>) </rp></ruby>b> (しん) +
Ultimate Gem God +
窮極寶玉神 +
궁극보옥신 +
Ultimate Gem God +
Ultimate Crystal +
Archseries page +
Cristalino(a) Definitivo(a) +
Kyūkyoku Hōgyokushin +
Cristal Definitivo/a +