Fetch lands Fetch lands ([c]Polluted Delta[/c], [c]Bloodstained Mire[/c], [c]Flooded Strand[/c]): Fetch lands work great in conjunction with dual lands because they can fetch the dual land of your choice directly from your library
Shaymin from the Leafeon vs Metagross Expert Deck [E], meanwhile, is primarily included for its Celebration Wind Pok-Power that loads up Mewtwo ex from Psycho Drive [BW3] with Energy cards

4 Relentless Dead 4 Diregraf Colossus 4 Cryptbreaker 2 Lord of the Accursed 1 Plague Belcher 4 Dread Wanderer 4 Wayward Servant 4 Relentless Dead 4 Diregraf Colossus 4 Prized Amalgam 4 Haunted Dead 4 Cryptbreaker 4 Scrapheap Scrounger 4 Dread Wanderer 1 Miasmic Mummy 4 Lupine Prototype 4 Cryptbreaker 4 Scrapheap Scrounger 2 Hazoret the Fervent 2 Flameblade Adept 4 Dread Wanderer 4 Bloodrage Brawler 2 Archangel Avacyn 4 Thraben Inspector 2 Thalia, Heretic Cathar 4 Scrapheap Scrounger 4 Toolcraft Exemplar 4 Dread Wanderer 4 Crocodile of the Crossing 4 Channeler Initiate 4 Exemplar of Strength 4 Hapatra, Vizier of Poisons 3 Manglehorn 4 Plague Belcher 4 Archfiend of Ifnir 4 Crocodile of the Crossing 4 Channeler Initiate 2 Exemplar of Strength 4 Hapatra, Vizier of Poisons 4 Plague Belcher 4 Ruthless Sniper 4 Archfiend of Ifnir 4 Curator of Mysteries 3 Horror of the Broken Lands 4 Shadowstorm Vizier 4 Ruthless Sniper Turn 1 Flameblade Adept

I think Ill put it into a deck that also has Makeshift Mannequin or Betrayal of Flesh for the big blowout
it also enhances the power of Fusion Strike System, Genesect Vs Ability that allows the player to draw cards until the number of cards in the players hand equals the number of Fusion Strike Pokmon the player has in play