1) First off will be my starter. In Pearl, I chose Piplup. When I get Platinum, I'll get Turtwig. It reminds me of Squirtle...
2) I will catch different Pokemon. Besides Turtwig, I think I'll try to catch a Starly, an Elekid, a Magby, a Buizel, and a Riolu. I'll also try to make them focus on their strengths.
3) I'll also try to breed more in Platinum. I mostly do my breeding in Emerald.
4) I'll try to trade between both Pearl and Platinum.