There are many different ways, including:
1. From the massage lady in Vielstone City
2. Walk in the park at Hearthome City, and talk to your Pokemon every once in a while when you're in there
in platinum she is in the Pokemon contest center
You can't. The only way to trade items is to make a Pokemon hold the item you want to trade.
no such code. It will be avaiblee when they make the new DS Action Replay coming out in June 2009 (They will also have Pokemon Platinum on that AR)
you can get 16 key items in Pokemon platinum.
There is no rental Pokemon in in Pokemon platinum
hearthome city
The Super Contest hall
in platinum she is in the Pokemon contest center
hearthome city
no
No!
Then you can play all contests levels and you are TOP contest trainer
hearthome city.
no
no
no no no no no no no no no no no no NOOOOOOOOOOO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
No battle you just show off your Pokemon and if you are lucky you win.