It's not in any pack because it's not on 2010.
Red Dragon Archfiend can be obtained in "The Duelist Genesis" booster pack, or as a reward from defeating Jack Atlas an undesignated number of times in a Duel.
Blue-Eyes Ultimate Dragon appears as a Super Rare card in the "World Championship Edition 3" booster pack.
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".
Yes, it can be obtained as a gift from Yusei for defeating him a number of times. It can also be obtained in "The Duelist Genesis" booster pack.
you get it in the stardust overdrive pack.
Sky Dragon was in Tournament Pack 2, which has been out of print for over a decade. Your best bet would be to look for it on eBay. get it from yugioh: legendary collection. it is also available in a hard to find yugioh pyramid of light comic, and was available as a shonen jump promo.
its already out its yusei duelist pack
you need to defeat Bastion 10 times
Rainbow dragon is found in the card pack "Tactical Evolution."
It's not in any pack because it's not on 2010.
Both are inDuelist Chazz Princeton.
Walmart or a yugioh store.
you can't the stardust accelerator is yugioh 5ds. Head of exodia is original yugioh
You can get it from The Shining Darkness booster pack OR you can buy a Black-Winged Dragon Tin from 2010 Collectors Tins(release date is October 31). I hope this could help!
World Championship pack 4 use this link to find out how to unlock all packs in WC 2010 http://www.gamefaqs.com/boards/genmessage.php?board=978594&topic=53671965
Each box set of three Retro Pack 1 cards, comes with a secret rare Blue-Eyes Ultimate Dragon card.