I currently have some quite highly valued pokemon sitting in my PC that I'd be happy to trade. Including...
Shiny Dialga (level 47, name in Japanese)
Multiple Dialgas and Palkias (I'll be really resonable with them, I don't even want them anymore)
4 Manaphies
A level 100 Alakazam (I have two, since I caught an Abra and used it as if it were my starter, but traded for another which I don't really need)
Groudon (I have a level 100 one of these, so I'm trading my other one off)
Kyogre (Same as with Groudon)
Quite a few pokemon that I acquired through swarming and Pokeradaring and then evolved to fill my dex, which are now wasting space.
All 28 Unowns