in the garden in oberg sity
There is no key, you must have a Pokemon with at least ten ribbons.
the ribbon syndicate but to get in there you have to get 3 great ribbons to get into there
You have to get enough ribbons.
there is not a code but a pokesav
10
U win a contenst in Hearthrome city in Pokemon diamond, pearl and platinum
You can buy ribbons (for a very high price) in one of the battle frontier area's that's all.
the first Pokemon in your party must have ten ribbons on it.
uhhh talk to one of the ladies and give one of your Pokemon a pokeball
You need ten ribbons on your first Pokemon but, sometimes once you get in there your Pokemon won't like you as much.
1.Contests 2.Elite four 3.Ribbon syndicate 4.Sunnyshore 5.Etc
Gohearthome city and there should be someone saying that they will show you where it is!