its preferable to test this out before answering that is of course if you haven't already, sorry & thank you..
sometime after:
It only says that both work. It doesn't say anything about stacking. commented 1 day ago by sumwun
ohkay sorry there. I think this might help you a little bit:https://bulbahandbook.bulbagarden.net/pokemonsunmoon/guide/sos-battle-chaining commented 1 day ago by A.G.47
i've did some long looking on serebii, bulbapedia and bulbahandbook (as well as the link A.G.47 gave above) but found nothing about the abilities/adrenaline orb stacking with eachother execpt for them just making wild Pokémon more likely to call allies for help (as sumwun stated)..
Source(s):
An Adrenaline Orb increases the chance of allies being called (From Bulbahandbook's SOS Battle & A.G.47)
Other wild Pokémon (From Bulbapedia's SOS Battle)
Activating S.O.S. Battles (From Serebii's SOS Battle)
Adrenaline Orb (From Bulbahandbook)
Adrenaline Orb (From Bulbapedia)
Adrenaline Orb (From Serebii)
Pressure (From Bulbapedia)
Unnerve (From Bulbapedia)
Intimidate (From Bulbapedia)
Pressure (From Serebii)
Unnerve (From Serebii)
Intimidate (From Serebii)