YKT-63 is an enemy in Final Fantasy X. It is fought in Bevelle before Yuna's wedding and after escaping from the Via Purifico. If it is the last enemy standing it will use Thrust Kick which will Eject one character out of the battle, preventing them from gaining any AP.
The YKT-63 will drop armor with any combination of up to three elemental ward abilities and weapons with Strength or Magic +3% or 5% bonuses, as well as any of the elemental strike abilities. These drops are identical to the drops of the other machina in Bevelle, YAT-99.