LogFAQs > #880534627

That's an illegal selection, unfortunately...you're supposed to grab something as per Variable Weapons System.

Variable Weapon System (Results) - After each battle that he participated in, X gains a pre-selected spell or technique a randomly selected rostered enemy mercenary that they could use given the restrictions in their battle write-up. This ability may activate on a 50% success rate even if Mega Man X was not rostered for battle. This will be added to his customization and can be selected for each subsequent battle. He may only hold 8 spells/techniques, though if gaining one would put him above 8, he may replace one.

The custom isn't a preselected spell or technique, needless to say. Normally I would random this, but since it would take an infinity of hours to comb through ten fucking mercenaries working out what all they have for spells and techs and we didn't catch this last week, we'll allow you to pick something actually valid. Please select a spell or tech for X to gain now.
---

Shine on, you crazy diamond.