You will find the YKT-63 during the wedding portion of Bevelle, as well as upon escaping from Via Purifico. Should this enemy be the last one remaining, it will use Thrust Kick to eject characters from battle. It doesn’t use Thrust Kick if there’s only one party member left, or if it has been Provoked. Note that Kimahri can learn Thrust Kick as a Ronso Rage, if he uses Lancet. It is weak to both Fire and Water, so you can use Lulu’s black magic to help bring it down. Otherwise, anything else will work. It’s best to defeat this enemy before any others, to avoid Thrust Kick.