no you cant
only giratina can use it
and ARCEUS only by an event
http://bulbapedia.bulbagarden.net/wiki/Shadow_Force_(move)
There isn't a tm for shadow force, and shadow force wasn't invented until diamond and pearl.
A TM modifier is a code that will change a certain TM number to a different move that was not a TM. You use it for teaching moves to Pokemon that can't normally use that move. For instance you activate a code for Shadow Force TM#01 it will change TM #01 which is Focus Punch into Shadow Force! It is only of use if the code changes a TM than can be learned by ANY Pokemon.
TM 30 is Shadow Ball
Shadow Ball is TM 30.
a good moveset for giratina would be shadow force( start ),aura sphere( lv 90), flamethrower/fire blast( TM ) and dragon pulse ( TM ). Other good moves are earth power( start ), Draco meteor( tutor ), shadow ball (TM),psychic(TM).
it is TM 30...
no
it is a ability not a TM dummy
TM Hyper Beam TM Psychic TM Solerbeam TM Shadow Ball
You can find TM 30 shadow ball in the last floor of MT.PYRE and in the Pokemon tower
shadow ball is the strongest ghost TM
Infernape can learn Shadow Claw by TM 65.