Boas!
O Serebii já criou uma lista dos Pokémon que, para já, não se encontram de maneira nenhuma em XY. Através desta lista já sabemos quais poderemos preparar para transferir em Dezembro de BW para o XY.
Quase todos os lendários e iniciais estão nesta lista!
Podem ver a lista completa no Post Completo!
Abraços, Portuga!
#019: Rattata
#020: Raticate
#052: Meowth
#053: Persian
#109: Koffing
#110: Weezing
#137: Porygon
#151: Mew
#152: Chikorita
#153: Bayleef
#154: Meganium
#155: Cyndaquil
#156: Quilava
#157: Typhlosion
#158: Totodile
#159: Croconaw
#160: Feraligatr
#201: Unown
#233: Porygon2
#234: Stantler
#243: Raikou
#244: Entei
#245: Suicune
#249: Lugia
#250: Ho-Oh
#251: Celebi
#252: Treecko
#253: Grovyle
#254: Sceptile
#255: Torchic *apenas por evento
#256: Combusken
#257: Blaziken
#258: Mudkip
#259: Marshtomp
#260: Swampert
#287: Slakoth
#288: Vigoroth
#289: Slaking
#343: Baltoy
#344: Claydol
#349: Feebas
#350: Milotic
#351: Castform
#377: Regirock
#378: Regice
#379: Registeel
#380: Latias
#381: Latios
#382: Kyogre
#383: Groudon
#384: Rayquaza
#385: Jirachi
#386: Deoxys
#387: Turtwig
#388: Grotle
#389: Torterra
#390: Chimchar
#391: Monferno
#392: Infernape
#393: Piplup
#394: Prinplup
#395: Empoleon
#401: Kricketot
#402: Kricketune
#420: Cherubi
#421: Cherrim
#427: Buneary
#428: Lopunny
#431: Glameow
#432: Purugly
#456: Finneon
#457: Lumineon
#474: Porygon-Z
#480: Uxie
#481: Mesprit
#482: Azelf
#483: Dialga
#484: Palkia
#485: Heatran
#486: Regigigas
#487: Giratina
#488: Cresselia
#489: Phione
#490: Manaphy
#491: Darkrai
#492: Shaymin
#493: Arceus
#494: Victini
#495: Snivy
#496: Servine
#497: Serperior
#498: Tepig
#499: Pignite
#500: Emboar
#501: Oshawott
#502: Dewott
#503: Samurott
#546: Cottonee
#547: Whimsicott
#554: Darumaka
#555: Darmanitan
#562: Yamask
#563: Cofagrigus
#592: Frillish
#593: Jellicent
#602: Tynamo
#603: Eelektrik
#604: Eelektross
#605: Elgyem
#606: Beheeyem
#626: Bouffalant
#638: Cobalion
#639: Terrakion
#640: Virizion
#641: Tornadus
#642: Thundurus
#643: Reshiram
#644: Zekrom
#645: Landorus
#646: Kyurem
#647: Keldeo
#648: Meloetta
#649: Genesect