Offer:
Latias (BT, still lv50)
Shiny Oddish, Mightyena, Tentacool, or Weezing
For:
Arceus
and Haley Mew if UT :D
Might take awhile if you want Weezing or Oddish, I gotta Pal Park them (and I have a DSi, so I will have to borrow my friends DS).
Oh and all of my shinys are nicknamed (lowercase...