I had the same issue on my white version. I picked espeon on that one and it's saying I never played the game. My black version worked though.
Currently not trading or battling until my router is replaced.
Current shinies: Venasaur, Meganium, Cyndiquil, Totadile, Treeko, Torchic, Mudkip, Turtwig, Chimchar, Piplup, Ditto, Metagross, Umbreon, Darkrai, Cloyster, Squirtle. Just needs me some Gen 5 Starters and Charizard. (Most is not for trade unless I get a good offer.)
Looking for: Shiny Absol, Shiny Ekans, 1-4 gen fossils,
pokerus, Rayquaza, Darkrai and Shaymin.
Can give: Spiritomb, Victini, UT Shaymin, Eevee, Event Celebi, Pokerus, Zorua, both 5th gen fossils and all starters.