Agassiz Town

Perpetually obscured by a sandstorm, Agassiz is a desert town connected by Route 308.5 to the north, Route 309 to the west, and the Psychic Temple in the middle of town. It's the location of the Secret Base as well as the third gym.

Walkthrough
Upon entering town the player comes across a cutscene involving Jake and a Team Asgard/Olympus Commander. Once the cutscene completes, the player must battle Jake. Defeating Jake earns the player the HM for Cut as well as safe passage into the heart of Agassiz Town.

Because the gym is currently inaccessible, the player must complete the Psychic Temple before gaining access to the gym.

Even after defeating the gym the player will still be unable to access Route 309. The player must travel back to Fianga City where they will now be able to use Cut to access the gym. Once the Fianga Gym has been cleared, the player will be able to continue on their journey by entering Route 309.

Before completing the events in Agassiz Town the player should travel to the northeastern part of town where they will be able to access their Secret Base for the first time. Also, a Black Belt claims to be able to teach the player's Pokémon or, however neither of these moves appear to be compatible even with the Pokémon that learn them through level up.

Obtainable Items

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Obtainable Pokémon

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Encounterable Pokémon

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Secret Base
In the northeastern part of town the player will be able to gain access to their Secret Base as well as obtain TM43, which will allow them to access alternate entrances to the Secret Base all across the region. Note that if the player has enough money they will be able to upgrade their entire Secret Base once, but will not be able to do so again until reaching the Aroma Region.

Custom Move Tutor
Inside of the Pokémon Center, the player will be able to teach any of their Pokémon a move from the Custom Move Tutor. Although it costs 5000 to teach the move to each Pokémon, changing the type and/or name is completely free of charge.

Sassy Nature Changer
In the house directly south of the Agassiz Town Gym, the player will encounter a Nature Changer capable of changing the selected Pokémon's nature to Sassy. Beware that this can only be done once.

Agassiz Town Gym
The Agassiz Gym is a Rock-type gym, so bring Water-, Grass-, Fighting-, Steel- or Ground-types for an advantage. There's a sandstorm inside so the Go-Goggles should prove useful. To get to Jonathan the player must push the boulders aside and fight the gym trainers to make a path over the sand.

Gym Leader Jonathan

 * Items: 1x Super Potion, 1x Hyper Potion

Trivia

 * Agassiz Town is named after Lake Agassiz
 * Two of the trainers in the Agassiz Town Gym, Falkreath and Solitude, are named after hold capitals in Skyrim, the fifth game in the Elder Scrolls series.