if you mean the girl at the resort who has lost her suite key then this is how to find it.
1. go to the reception at the bottom of the resort
2.exit through the top door.
3. use the poketch app item tracker or something and it should locate the hidden item.
You find the Suite key when you exit the main hotel lobby and using the dousing machine.
use your itemfinder to get it. It is under an umbrella next to a swimming pool.
Hope I helped you out!
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.
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.
The key can be found by using the Dowsing Machine in the area near the southern exit of the Valor Lakefront. Upon talking to the girl, she will take it back and enter her suite.She'll give you a White Flute (attracts pokémon in tall grass) once you go inside and talk to her.
in soul silver and hart gold go to goldernrod city go to the flower shop and have shaymin as your lead Pokemon and walk trough so shaymin apears out of the pokeball and the first person tells you it so cute it shaymin and then he gives you the gracidea flower then you can change it into sky form. from Little B
there was a event sorry but i THINK this might work i doubt it... go to 3rd floor of tv station in jubalife and talk to the guy next to the girl. he will give you an interview. say everyone happy then wifi connection and hell give you a mystery gift that might be the secret key. your welcome!
It's exclusive to Pokemon platinum version.
It is the warehouse in veilstone city.
give him a secret key the different secret key the different rotom
Its behind the bush near the one guy with the hat.
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.
Pokemon event
In Pokemon Platinum you dont get the key from a grunt you get from the detective, before getting the key you have to go talk to prof. rowan in the library .
no only codejunkies.com which hasn't got it out yet
http://www.neoseeker.com/Games/action_replay/
go on Pokemon Platinum Walkthrough you'll might get the idea.
You can only get the secret key in Pokemon Platinum
you need wifi do get it!