For my case, dunno is heng or suay, both main and baby accounts got the Ex pass, and both on the same location and timing.
Heng is at same location, suay is I only have 1 hp, and I toggle between my accounts when playing PoGo. haha.
Guess I will use my baby account for that day as it is the 1st Ex pass for it.
Borrow a phone ... can even ask at the raid. I recall I was at ex-raid when someone also had 2 accounts with ex-raid but only one phone. I lent him my other phone.