(no) Waste of master balls. How did you get that many anyway? I have doubts on your good sportsmanship, lol!
You can get them on route 228
Lilycove city
you find it in the last route 'Quiet cave' it takes 100,000watts to unlock
Spiritomb (often misspelled as Spiritome) is a ghost/dark type of Pokemon. It is possible to catch one by going to the Hallowed Tower on route 209.
You can get a master ball in the hideout of team aqua in Liliycove city. I don't know the exact route, but the warp panels will teleport you to a place with 4 item balls, one of them is a master ball.
In Pokemon black you can get only one master ball, heading to route 10 having all the badges Professor Juniper will stop you and she will give you one.
There are only two master balls in the game, the first you get from playing through the story and the second is from the lottery prize draw if you get first prize. Another way to get master balls is to use an action replay or get them from trades by other people if they have their Pokemon to hold it, but they are usually cheated to obtain.
You can catch it on a really advanced route on the pokewlaker but it is very hard to find.
To get Spiritomb you must talk to 32 other players Underground. Then set the Odd Keystone in the ruins of the Hallowed Tower. (South of Solaceon Town) Look into the odd rock formation on Route 209. Spiritomb should appear.
There's only one legendary you can get on route 209. Spiritomb. You can get it by first putting the odd keystone into the broken tower. then greeting 32 separate friends in the underground (not the guys selling stuff) then going back to that broken tower and there's Spiritomb.
Spiritomb is Ghost and Dark Type. Extra Information: To catch Spiritomb, you need to place an Odd Keystone in the Hallowed Tower in Route 209 and have 32 conversations with a friend underground (You will catch Spiritomb in 25 lv.) Hope I helped :)
Route 110