I try to get the highest IVs. I don't use action replay so don't demand for something too rare. I usually won't trade away anything over LV. 30. Here are the available pokemon:
Recently Hatched
Pichu LV. 1 with Volt Tackle - Any Starter.
Turtwig LV. 1 - Chimchar or Piplup.
Older Ones
Extra Arceus LV.(I forgot) - Any generation 4 or 5 legendary.
I have numerous legendaries (about 20-something) and wondering if you would trade for that arceus, i have jirachi, almost all legendaries from pearl, ho-oh, lugia, giratina...