This is a guide for Mission 18: “The Counterpart” in Pokémon Legends: 
Arceus (PLA).
How to Start Mission 18¶
(1 of 2) It’s too bad you didn’t have the foresight to make two Red Chains.
It’s too bad you didn’t have the foresight to make two Red Chains. (left), Anyway, the Professor has a plan for stopping the second Legendary. (right)
You’ll automatically receive this mission when you return to the Summit Camp after completing the previous mission, “Atop Mount Coronet”. A second, overwhelmingly strong Legendary Pokémon has appeared, but you currently lack the means to stop it. After racking his brain for a bit, Professor Laventon has a solution.
1. Visit the Primeval Grotto¶
(1 of 2) The Origin Ore lies within the Primeval Grotto.
The Origin Ore lies within the Primeval Grotto. (left), Beware of an alpha Probopass by the south entrance. (right)
From the Summit Camp, make your way east-south-east towards the Primeval Grotto. You can quickly reach there by gliding with 
Braviary. Note that the south entrance of the grotto is guarded by an alpha 
Probopass; meanwhile, there’s a side entrance to the west that’s relatively safe.
Inside the grotto, make your way to the suspicious spot towards the east where the glowing red stones are. Before you can make a move, the Bandit Sisters jump in to stop you. Dude, we’re trying to save the world here…
Bandit Charm¶
(1 of 2) Lady, there’s a time and place for everything…
Lady, there’s a time and place for everything… (left), Then again, it’d be too easy if you could just walk in and grab the ore. (right)
Rhydon is easy pickings for Water or Grass-types. Ground and Fighting-types should do OK, but most are physical-based and Rhydon has high Defense. Steel-types are ill-advised due to Rhydon’s Ground moves.
For 
Gengar, Dark and Poison-types are great. Psychic-types should do fine too, but make sure Gengar doesn’t survive or its Dark Pulse will hurt. Be wary of Hypnosis, which can cause drowsiness.
After shooing away the unwanted guests, you’ll receive the Origin Ore that you were seeking.
2. Return to the Summit Camp¶
(1 of 2) The Prof should be pleased to see this.
The Prof should be pleased to see this. (left), For Arceus’s sake, don’t throw this at a Bidoof or drop it in a river! (right)
Fast-travel back to the Summit Camp and show Laventon the goods. You’ll be whisked back to Galaxy Hall at Jubilife Village. Akari/Rei will work their crafting magic and produce the Origin Ball–a one-of-a-kind Poké Ball that can ensnare the remaining Legendary Pokémon at the Temple of Sinnoh.
3. Head to the Temple of Sinnoh¶
Origin Ball firmly in hand, make for the Front Gate of Jubilife Village. You’ll bump into Cogita who offers some advice, before going to do some pre-apocalyptic shopping. Set out for the Coronet Highlands, choosing the Summit Camp as your start point. Like the previous mission, head north-east towards the Stone Portal and go inside.
Along the way, you’ll run into Volo, who’s way too excited about this kind of thing. On the other side of the Stone Portal, proceed up the slope towards the front of the temple. Adaman, Irida and Kamado will be waiting to give you the final go ahead.
4. Confront Palkia or Dialga¶
(1 of 2) Dialga’s Origin form.
Dialga’s Origin form. (left), Palkia’s origin form. (right)
This is it: the final battle. Depending on which clan leader you chose at the Ancient Retreat, you’ll encounter 
Palkia (Adaman) or 
Dialga (Irida). However, this time, the Legendary somehow gains incredible power, transforming into a brand new form…
Upon defeating and catching the Legendary Pokémon, peace will finally return to the Hisui region. This mission–and the story–will come to a close. Now sit back and enjoy the credits (or go and make some coffee etc.)!
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