Pokehadron Collider

The PokéHadron Collider is a location where scientists do significant amounts of research on Pokémon. It becomes a central plot point after the player completes the events in Onega Town.

Walkthrough
The entrance to the PokéHadron Collider from Fianga City is blocked by a Team Olympus/Asgard Grunt, so the player has no choice but to enter the Collider from a tunnel connecting it from Nyasa Town. When the player enters the tunnel to the PokéHadron Collider they can't turn back, so they will just have to continue until they get to the lab where a Team Asgard/Olympus commander will be waiting for them. The player will then have to fight the new antagonist.

After defeating the Asgard/Olympus Team commander inside of the PokéHadron Collider the player can speak with the scientists inside. An Eevee trade exists on the second floor and a Ditto can be encountered on the second floor at level 18 after interacting with the scientist facing the northern wall.

TIP: Make sure you're prepared to fight the Ditto before talking to the scientist that triggers its encounter; you will not be given a second chance to catch it and you will not be able to obtain another Ditto until reaching the Aroma Region.

Obtainable Items

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Obtainable Pokémon

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Encounterable Pokémon

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Return Tutor
A Move Tutor on the first floor will teach Return to a Pokémon that can learn it. This can only be done once, but because a TM containing Return can be obtained relatively quickly, this drawback is fairly insignificant.

Legendary Pokémon
If the player has the power to use Tesseract, they may use it at the end of the tunnel that connects Nyasa and the PokéHadron Collider together to cause Volcanion to appear at the tunnel's end. Volcanion is at level 100 when encountered.