Without these trades, the game's impossible. Diamond users! Bring Seel, Scyther, Murkrow, Larvitar, Poochyena, Aron, Keckleon, Cranidos, Stunky, or Dialga. Pearl users! Bring Slowpoke, Pinsir, Misdreavus, Houndour, Stantler, Spheal, Bagon, Sheildon, Glameow, or Palkia. The challenge is -always- finding the opposite version...