The suite key is well hidden. When you enter the resort area from Pastoria, go left one step and it should be there. If not, use your item finder in front of the door and it should react.
You give it to the lady
the game of platinum
There is no such thing as a Sweet Key, if you mean the Secret Key that is used to find the 5 Rotom Forms you had to download it via WFC when the event was, it's over now.
Go into Eterna forest at night and Gardenia should be there. Go past the trees and into the Old Chateau and there will be a TV in one room. Thump the TV and Rotom will come out.
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pikachu
It is the warehouse in veilstone city.
In diamond, pearl and platinum version you get a key from a trainer and you go to route 209 and near the lake threre will be a broken stone tower and you put the key in.
It's exclusive to Pokemon platinum version.
give him a secret key the different secret key the different rotom
You cannot get the secret key in pearl or diamond version. It was only available for a limited time via mystery gift on platinum version from June 2009 to July 2009. So, it is now impossible to obtain even in platinum version. Sorry, but you lucked out.
the game of platinum
There is no such thing as a Sweet Key, if you mean the Secret Key that is used to find the 5 Rotom Forms you had to download it via WFC when the event was, it's over now.
There is no space suit in the Emerald Version.
no only codejunkies.com which hasn't got it out yet
http://www.neoseeker.com/Games/action_replay/
Okay you go up to the manager and say "this key is not good enough I need it in platinum. The reason is that if it is not platinum, I am allergic.
You can't, Mewtwo is not available in Platinum.