All 3 starters will have battle bond as their ability. Picture this
>Get to your first UB fight>The kahuna and Tapu have been blown the fuck out>You have to fight him and your starter is forced to be on your team>You battle the UB and it ohko's all of your pokemon except for your starter>The ub attacks your starter leaving him with just one hp>cut to everyone screaming about how they're doomed>all of the sudden>https://www.youtube.com/shared?ci=y-4hP333Dqs kicks in>Your starter gets back up and starts glowing>Battle bond kicks in>Everyone's cheering you on>You're now able to fight the UB 