Question

If so what are they for which UBER

Answer 1

No, not every legendary have a signature move. Here are the pokemon who do with the move:

Ho-oh-sacred fire
Lugia-areoblast
Jirachi-doom desire
Deoxys-psycho boost
Dialga-roar of time
Palkia-spacial rend
Heatran-magma storm
Regigigas-crush grip
Giratina-shadow force
Cresselia-lunar dance
Manaphy-heart swap
Darkrai-dark void
Shaymin-seed flare
Arceus-judgement

Remember smeargle can learn all these moves with sketch.

Comments

Also resheiram and zekrom

Answer 2

Correct pokemon black but you are forgeting that as of gen V mewtwo know has a signiture move psycho-break which uses special attack for a physical move. Latios and Latias have Luster purge and mist ball respectively in every generation.