Abilities such as Last chance, Combo Boost and HP Boost can be obtained through Command Fusion. You must combine two commands and add a item which will give the command an ability to learn. For example, if you combine Cura and Cura, and also add a Rise Crystal, the result will be a Curaga command with the ability "Air Combo Boost". Once you master this Curaga command, the ability "Air Combo Boost" will still be available even if you unequip the command.