Champions get their signature attacks at levels 60 to 74. Ultimates learn them at level 75 to 80 or 85. Megas learn them at level 81 or 86 to 99. Also, BlackWarGreymon has a different name but a simillar signature attack. WarGreymon's signature attack is Terra Force, but BlackWarGreymon's signature attack is Terra Destroyer. There maybe other similar occurrences in the game.

Note: All Digimon learn the attacks at the same level. All Champions learn their signature attacks at level 60. All Ultimates learn their signature attacks at level 70. All Megas learn their signature attacks at level 85.