I bred it 2009 and HGSS were released in March/April 2010 iirc, besides: it hatches @ valley windworks. but i remember trading the eevee nicknamed to someone, he gave me a clone back and renamed it. or maybe even the ev trainer messed it up somehow. well, I checked the eevee now and it says that it has got "valid gen 4 trash bytes from original name "EVOLI", so I suppose, I'm just going to train it again, and release the jolteon without trash bytes :>
but still...thanks for your help, joel