Here are the names of the 18 unision atacks:

Cross Thrust
Pow Devastation
Pow Spear
Pow Blade
Mirage Thrust
Dark Serpant
Power Thrust
Photon Blast
Plasma Blade
Lightning Tiger Blade
Photon Tempest
Thunder Tiger Blade
Arch Wind
Lightning Punishment
Fiery Beast
Stardust Rain
Mjollnir
Prism Stars