You mean you can't rng capture a shiny Tornadus (even though you have a black version)?
Also,
I was wondering if you can try rng capturing these shiny?
Shiny Jolly Deerling (Male/Female)
Ability: Sap Sipper
31/31/31/x/31/31
Desired ball: Premiere ball
Shiny Adamant Roggenola (Male)
Ability: sturdy
31/31/31/x/31/31
Desired ball: Dive ball
Shiny Timid Woobat (Male/Female)
Ability: Unaware
IV's: 31/x/31/31/31/31
Desire ball: Dusk ball