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Willing to trade a female Greninja, Dittos and a Goodra for any of these:
Aegislash
Noivern
Nearly any shiny Pokemon
Blastoise
Venasaur
Ampharos + Ampharosnite
Well leveled Aerodactyl
Mewtwonite Y
A well leveled Haunter/Gengar
Sylveon
Anything that will be good for the Elite Four