Just randomly searching I came across other really bizarre trades: scizor for cyndaquil (and since the pkmn bank isn't
released yet, I wonder how anyone could get a cyndaquil yet)
Scizor for Zapdos (even with the option to disable the special pkmn, Zapdos is apparently not classified as a 'special')
You can search and request Pokémon you haven't seen now. There's an option at the end of the alphabet that says "What Pokémon?" that allows you to manually type in the Pokémon you're looking for/requesting.
As for the "special Pokémon", I belive only Pokémon that are banned from official tournaments and battle facilities are considered "special Pokémon" (i.e. Mewtwo, Mew, Lugia, Ho-Oh, Celebi, Kyogre, Groudon, Rayquaza, Jirachi, Deoxys, Dialga, Palkia, Giratina, Phione, Manaphy, Darkrai, Shaymin, Arceus, Victini, Reshiram, Zekrom, Kyurem, Keldeo, Meloetta, Genesect, Xerneas, Yveltal, and Zygarde).