Rainbow dragon is found in the card pack "Tactical Evolution."
you would have to download a hack from the internet
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Armed Dragon LV7 appears as a Super Rare card in the "Soul of the Duelist" booster pack in "Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia".
Red Dragon Archfiend can be obtained in "The Duelist Genesis" booster pack, or by defeating Jack Atlas an undesignated number of times in a Duel or Turbo Duel.
Koumori Dragon can be obtained in the "World Championship Edition 6" booster pack.
It can be attained via Action Replay as of now. They are beginning to release Egyptian God Cards for download on Wi-Fi. Slifer the Sky Dragon has been available for download.
"Baby Dragon" is in the booster pack "Dark Beginning 2".
Armed Dragon lv 10 can be found in world championship pack #4, which can be unlocked by defeating 20 W.C. mode tag team opponents 5 times. Hope this helps it toke me ages to fish him out lol
It is not available in Yu-Gi-Oh! World Championship 2010: Reverse of Arcadia.
Power Tool Dragon can be obtained in the "Raging Battle" booster pack or as a reward from defeating Leo an undesignated number of times in a Duel.
Stardust Dragon can be obtained in "The Duelist Genesisi" booster pack, or as a gift from Yusei Fudo after defeating him an undesignated number of times in a Duel or a Turbo Duel.
armed dragon lv 10-World Championship Edition 4 pack dark armed dragon-Phantom Darkness pack