Since we're riffing on Ghost Trick, we do need our eponymous ghost. Good luck Akari! As happened in my very first challenge against Origin Forme Giratina, it rips the last of her team to shreds, and she follow soon after, to a more mortal extent.
Newly dead and incredibly confused, she rouses to the voice of something in her nonexistent ear telling her to wake up, and that her work isn't done yet.
She tunes back into reality-- still a little off balance, but generally starting to get a grip on what's going on-- to realize that a) she just died not long ago, b) Volo's still there, and c) he's pissed.
He's actually trapped up here right now, because someone's blocking the temple's exit.
Volo's team was totally KO'd, and Giratina is nowhere to be seen for backup; he can't fly off.
Enter our lucky Lynne, who has actually been here since before Akari woke up.
Ingo is at the temple's landing, seemingly waiting for something. He's very obviously aware of Akari's body, given the way he's acting, but not of Volo's lingering presence.
Volo's patience has run out. He has no other ways to leave and, Akari hears when she gets near enough, he can't afford to risk the Warden's reinforcements arriving.
So he lashes out a second time, this time taking matters into his own hands, and stabs Ingo while his back is turned.
The voice speaks up again, as Volo leaves the two bodies on the temple's floor. It encourages her to go say hello. Akari gets mad at it-- hello is not appropriate after they've both been killed-- but finds a path all the way from her body to Ingo's.
So, note for any non-GT natives: I'll be referring to 'cores' a fair amount. There are two versions of this. For now, some non-living objects have cores, which allow a spirit to hop on and hitch a ride or, potentially, manipulate that object (ex: a smoke bomb could be manipulated to make it go off).
The only reason getting across the temple is an issue is because Akari has to make use of chunks of ruined masonry and her own scattered pokeballs to cross the distance. Ghosts aren't free floating, and she has to pick out a path from objects substantial enough to have cores.
With some doing, she makes it to her destination. We'll go further into the second type of core when it's relevant, but for now, we note that Ingo also has a core-- and that it's different from what inanimate objects have. There's some kind of unconscious response at Akari's prodding.
Akari realizes that she 'woke up,' so that means she was probably unconscious, too. He'll wake up in his own time, then, and they'll figure this out.
'Oh?' asks the voice, 'You're content to lay down and die? Wouldn't you like to see something interesting?' And, in following its instructions/'following' that core instead, the world around Akari changes.
She's still by the temple stairs, but Ingo's body isn't here anymore; in fact, he's clear across the temple, kneeling by her own body. Alive. When she looks, she can also see Volo slinking around behind Ingo's back, trying to reach the exit, but before that can see any success, Ingo gets to his feet and walks to the top of the stairs.
Once there, he pulls his Celestica Flute out and plays it-- not just the melody to summon Sneasler, but something longer and more intricate. The flutes can be used for communication, too, so this must be the backup Volo was worried about-- Sneasler in particular, since she'd be closer/faster.
From there, pretty much the same thing plays out. The voice encourages her to try utilizing the skills she's learned to get across the temple, to see if there isn't anything she can do about that.
By the end of the replay, there's a tiny bit of response from the spirit with her-- formless, save for a hitodama*-- mostly consisting of confusion who he is and what's going on.
Akari grimaces and basically goes 'You know what? Go back to sleep. I got this.'
*Basically the wisps from Eerie Apparitions in the Night
She follows the lead again, restarting the scene. This time, as she crosses the temple while Ingo is kneeling next to her body, she strays near enough to Volo to hear him cursing to himself.
Specifically, he says something about the plates, and now this. At mention of the plates, she remembers that he was trying to force Arceus to remake the world, and obviously that didn't happen since everyone is still here.
Oh. Hah. That's kind of funny, actually. She failed, but got what Volo wanted: an audience with Arceus/the Alpha Pokemon advising her.
It turns out there isn't anything she can do to manipulate her body-- it doesn't even have a core-- but she is near enough to neatly jump into the emblem on Ingo's hat, so she does that.
From there, she causes utter chaos:
Undoes the decorate knots the security corps use to fasten their pokeballs, forcing Ingo to go collect them from wherever they've rolled. Gives Volo time/cover to get nearer the exit.
Using her own scattered pokeballs. Before she'd rolled them to cross distance, now she's using them to get underfoot.
Even uses the empblem to knock the bill of Ingo's cap down into his face, which gives Volo an opportunity to get to the very last bit of cover before the stairs.
All that done, Ingo still has the easier task, since he can just walk across the temple without reason to fear being seen. He arrives at the landing before Volo can make a break for it.
There's something that can be done, though: when he moves to call Sneasler, Akari sabotages the attempt, causing the flute to shriek instead.
Surprised and reeling from the sound, he steps back so as not to risk falling forward, and Volo seizes the opportunity. To buy himself a little more time, he still attacks, but not fatally, and not with a stabbing implement.
The plates are currently useless to him anyway, so he uses one to hit Ingo/stun him, and then flees.
Instinctively, Ingo reaches for his foremost pokeball, and Akari undoes that tassel too, foiling the attempt.
The indistinct spirit next to her asks why she did that; there had still been a chance to catch the person who might have been responsible for her death.
Surprised that he's that cognizant of what's going on-- if not his own identity-- Akari says that she knew that pokeball was Gliscor's, which was the only one of his Pokemon that stood a chance at catching up to/stalling Volo.
If that had happened, Volo would have been just as desperate to get away as earlier, and might have attacked again-- might have killed him again.
Said spirit doesn't argue against that; his only response is to thank her.
And, thus, time resumes in the new version of events.
Ingo steadies himself against the nearest pillar-- still dazed, but alive-- and follows through on calling Sneasler while he still has the flute in his hand.
Akari moves to help-- to roll Gliscor's pokeball over-- but he pops out instead. Since he released himself and doesn't have any orders, it's not a problem. He's just worried about his trainer.
Ingo stays still against the pillar for a bit, letting Gliscor do as he pleases. Mumbles something about his mind playing tricks on him again, and miserably looks back toward Akari's body.
After a moment to collect himself, he plays a second melody on the flute, picks up Glicor's pokeball (which has since been vacated by both of its inhabitants) and straightens up.
Doesn't go all the way to the landing this time; he's still a little unsteady after being bashed in the head, and that seems unsafe.
Obviously, Sneasler is the first to respond. Her first concern is the fact that Ingo is clearly injured, but he waves her off to focus on the actual problem. While she does react correctly to realizing Akari is dead, her behavior is a little odd, staring at this pokeball or that hunk of broken stone.
The reason she was called in the first place was to help take Akari's body somewhere more appropriate, but in short order, they find it can't be moved from the temple and are forced to leave it there. For lack of anything else to do for her, they settle her by the temple's focal point.
The second call won't-- and can't-- be answered for some time yet, which means there's no reason to linger up here. After her stray pokeballs have been hunted down, it's getting late enough that they have to leave or risk traversing the highlands after dark.
Akari hitches a ride, settling herself int he emblem again.
While the flute melody was calling for assistance from the Pearl Clan/specifically calling Irida, Melli would have been aware of something going on up there, and catches Ingo on the way past Moonview Arena.
Through their conversation, we learn that the both of them saw something happening at the temple (specifically, it would have been Giratina's arrival, though it was mostly just indistinct dark shapes) and that was why Ingo had gone up there in the first place.
He doesn't breathe a word about dying, himself-- it seems he's taken it to be some kind of byproduct from the head wound-- but informs Melli that when he went to investigate the activity, he found Akari's body + was unable to move it.
Melli is taken aback, and actually does seem a little upset. Excuses himself to report to Adaman.
Since she doesn't have anything to do beyond ensuring her friend is okay (ish), Akari continues to hitch a ride with Ingo, who eventually makes it to his own camp.
Sneasler is also being a good friend, and refusing to leave. Keeps sniffing around his head, which is valid, bc it seems to be causing some amount of pain/stress.
He's also trying to figure out what to do re: Akari's Pokemon-- what to tell them and when.
Sneasler keeps grabbing the pokeballs and hiding them, clearly expressing that she wants him to focus elsewhere. Akari doesn't necessarily want to leave her Pokemon in the dark, but also doesn't see the logic in making this happen right now.
She's taken to trying to distract Ingo, and it's working... better than she might have expected. Things like shifting this or that item to be more prominent are meant to be noticed, but she's also noticing him staring at items she's chilling in when she hasn't done anything with them yet/there's no way to manipulate them.
He doesn't fall asleep until quite late and, in all actuality, didn't mean to do so. Sneasler stays with him, and while her sleep schedules means she's awake for part of the night, stays quiet, watching whatever Akari manipulates without causing any fuss.
Midway through the night, once he's reliably asleep,, Akari pokes at his lingering core.
Obviously he's currently alive, so what happened before doesn't happen this time. It does, however, make a sort of connection.
In GT, I believe these cores are called Cores of the Dead, and through this experimentation, Akari realizes she can actually speak to him through this core. He's currently unconscious, and is still kind of... processing everything that's happened, so it's not the most sparkling conversation, but it's good to know. Also notable is the fact that, when she pulls away from the connection, no time has passed in reality.
Morning comes. It's not too much of a surprise that, upon waking, Ingo passes the conversation off as grief.