Were Is The Key That The Girl Has Lost In Pokemon Platinum?

Enter the gatehouse in route 213 and then exit the gate house (you do not need the drowsing app) take one step up and then look left and then press A to pick up the suite key. Go to the house where the lady is standing and talk to her. Then she will go inside. Then you go inside and talk to her again and she will give you a white flute. Ps: This only works for platinum. I am 100% sure that this will work.

Your need go in the hotel then your need go where  there 2 houses are there your need a app and your find it jou go stand where the stip is then do A and your got it go to that house give it to the women she go in her hous then you go in she gif your a white flute thats it thank your all

It's under the umbrella on Diamond and Pearl. On Platinum it's right outside of the check-in desk.

Go to route 213 go in the gate house and than go straight until you rich the exit than walk one step forward and turn left and press A than go to the women who lost her suit key talk to her and she will go in her house after she went in go in too and talk to her again then she will give you a   with flute