After your visit with Mesprite, it "plays" with you. It will run around the region like Latias does in Sapphire or like Latios does in Ruby. One easy way to find it is to get an app (Marking Map) on your poketch' from the President of the Poketch Company in Jubilife City after obtaining your 3rd badge.
He is running around the whole region, you have to have a app on the Poke-watch to see where... you have to go see the guy who gave it to you to get the app I think!
u don't go to johto in Pokemon platinum
Go to www.supercheats.com go to Pokemon platinum and then go to the code section in it there are awesome cheats there!
You need to go to pal park in Pokemon platinum to migrate.
GO to the spear pillar. go to youtube and write How to go to the Spear Pillar in Pokemon Platinum.
go to Google then type in Pokemon platinum
go to codejunkies.com and look up Pokemon platinum if its not there then go to supercheats.com search for Pokemon platinum and click on the ar codes button
go to youtube and type in Pokemon platinum episode 1.IT DOES WORK!
go on Pokemon Platinum Walkthrough you'll might get the idea.
go to the Pokemon league
To get in the library in Pokemon Platinum, simply go to Canalave City and enter the library in the northwest from the Pokemon Center.
u go to either www.codejunkies.com or u Google Pokemon platinum "Pokemon modifier action replay code"!!!