The key is somewhere just past the south entrance hidden on the floor so use the itemfinder to find it.
you get the white flute by findering the suite key at the valor lakefront
find places near 7 stars restaurant where you have to use rock climb (about 4 times)
right next to the back of the hotel in valor lake place
Go to the back of the hotel the second you get outside you should be able to find it using your item finder dowsing app.
At Valor Lakefront, a woman is worried because she can't find her suite key. She said she left with it at the 'reception desk', so going out the back entrance would help. So, when you get out of the back door, use the radar app on the poketch or keep pressing the 'A' button around the back entrance to find the key. (Hint, it is up to the left a bit when you first get out). Go to this website and scroll down it might help. http://pokemon.wikia.com/wiki/Pokémon_Diamond/Pearl_Walkthrough_(Part_6)
use the dowsing machine near the suite
a lava cookie
i heard that you have to have an AR. You Dont Need An ActionReply when you go outside of the lobby use your pokeradar it should be near the wall
you get the white flute by findering the suite key at the valor lakefront
The lava cookie is Lavaridge Town's local specialty. Lavaridge Town is a town in the Hoenn region. You can play in the Hoenn region in one of the Pokemon Ruby, Sapphire or Emerald games. The lava cookie heals all the status problems of one Pokemon and its tasty too!
give it to the lady that lost it:P
You give it to the girl who is locked out of her cabin. She will give you lava cookies
find places near 7 stars restaurant where you have to use rock climb (about 4 times)
Truly I dont think you can get it in Diamond or Pearl version sorry.
you can find the suite key by first going to valor lakefront [ not the actual lake the place with the resturant] use the pokemon watch app number 4 go to the regisration counter and walk out of it in the north direction, walk 1 step turn left and press A. the lady will give u a lava cookie if u go inside her house and talk to her.
on the side where the woman lost it, go to the exit gate(do not go in) go up two steps and it is on your right. It doesn't matter though because she only gives you a white flute,which makes Pokemon more likely to come to you yeah but, once you get every flute you combine them for a chance to fight Garitina, Dialga, and Palkia, which you can catch, but if you already have 1 of them that 1 won't appear, hope this helps
The Suite Key is northwest in front of the entrance to the beach of Route 213. You will need to use the Dowsing Machine Poketch App to find it.