Soul Collector's Cache Retired (Artifact, (2)) [= Whenever you Extort, put a charge counter on Soul Collector's Cache
Until it can be cured, your snoozing Pokemon is essentially a sitting duck in your active spot
(If a card attacks or is attacked by a monster, it gains 1000 ATK for each Leviathan Counter on the attacking/attacked monster during the Damage Step only)
For pure completion efficiency, singles-first is better
Personally, I think the best option for new players would be to buy the Sapphire/Ruby deck from Into the Inklands as it comes with Locations and it offers the opportunity to dig a bit more into how cards can interact together
Shun Kurosaki[edit] Yuya first met Shun when he kidnapped Yuzu's father to force the youth to Duel him, Shun considering Yuya's Dueling style an insult due to his background as a Duelist combatant