I would suggest whoever does learn Exorcism has health to spare as well as sanity, as doubtless the attempt to just keep the Pokemon still (especially if they're a Stalker) could get terribly violent. It may also be pertinent that whoever learns it has Rescue/Escape as well (or at least, that's preferred) as that means that they can immediately start the recovery process on their own, which means that if the Sin Purge Ritual turns rather poor, we can have a cycle of our three exorcisers going around and exorcising the Stalkers instead.
Personally I'd rather learn Escape/Rescue with my current choices, as my kit is geared for taking HP damage and trucking on and on and on as long as I can, so I'm OK with not having Exorcism, cool as that may be. Though, I could, if no-one else is going to.
I can also point out that, despite the odds, there may be more than one Exorcism Tutor. Just, be aware of that.
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