Cheer (battle element)

The ability to cheer, when it comes to Fiends being allies of the Gullwings in Final Fantasy X-2 International and Final Fantasy X/X-2 HD Remaster, is quite different from the ability of Cheer mechanic-wise, but the core concept of it is the same: to boost power.

How the mechanic works
This kind of cheering is effective in raising the power of allied fiends. However, it can also make a monster leave the fight, as well as decrease their power. To boost the power of a fiend present in battle, it is only a matter of pressing the R3 button. To decrease or have a fiend escape the battlefield, if that option is possible, merely pressing the L3 button is enough. The number of times needed for L3 to be pressed for the monster to escape depends on the number of stars, i.e. if there are 5 stars present, L3 must be pressed 5 times.

Strategic methods using cheering
Sometimes, an enemy can be Bribed for or have good items that Thieves can either Steal or Mug them for, and as the combat system is not the same of Yuna's previous journey, enemies can be defeated before the thievery/bribe attempt is successful due to the allied fiend being too powerful.

Since the fiends on YRP's side cannot be controlled directly, pressing L3 can decrease their strength to prevent the target monster from being killed off too soon, allowing the bribery or thievery of the desired items to happen.

Also, the fiend can be dismissed if it is too powerful for a bribery or theft attempt to even occur, if the fiend is too weak even with cheering set to maximum power, or if the situation is unfavorable for said fiend, even if both sides are vulnerable to the other (e.g., A Red Elemental on the team too weak to defeat a multiple of White Elements or other Ice-based fiends). That, however, depends on if the battle in question allows escape.