I have them all, but I'll let others trade with you first. If nothing else, I can clone a Modest Meloetta I picked up from a Trade Shop if you have something I don't (i.e. another nature of a Keldeo or Genesect or any other Event, or an Event I don't have at all, etc.).
Offering: Any breedable pokemon from Kanto, Johto, Sinnoh and Unova + Any breedable pokemon from Hoenn except Lotad, Seedot, Spinda, Corphish and Makuhita. And I do have all the starters to offer as well.
Did you not also want Lotad, Seedot, Spinda, Corphish and Makuhita? I have a full Pokédex, hence why I'm wondering. If any of these turn out to be impossible to get for some reason, I can breed them. If my existing ones are female (no idea offhand), I'll even add Egg Moves.
I could theoretically also pick up and import Spinda from Emerald, but I can't hack extra money into that game so I'd rather not waste it on exports until I find a source of virtually unlimited income. Better to breed.
Oh my God neither do I!!! Each of my friends gives me a blank stare when I start talking about it, so I had thought I'd better keep it to myself. After all these years :')... I firstly started playing it in my Playstation One, lol xD