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New region is based on Australia, with a highly urbanized coast and a desolate interior. The Elite Four are positioned in the middle of this interior, and a major part of the game is simply getting to them.
During this journey to the center of the region, you'll need to keep the player and their Pokemon healthy by bringing along supplies, like food, water, and medicine. Having a Pokemon that is hungry, thirsty or sick will make them less effective in battle, and evolved Pokemon require more food and water. If the player becomes too hungry, thirsty, or sick, they will faint and be airlifted back to civilization, with some of their money forfeited and all bosses that the player has defeated reset.
"Gyms" that exist in the developed parts of the region give out equipment like water filtration systems and portable stoves that can make the use of your resources more effective and otherwise extend your journey. "Trial captains" stationed in the wild will give you special saddles that you can use to ride Pokemon, increasing travel speed, allowing you to cross harsh terrain, or carry more supplies and equipment for you. The game also has numerous sidequests where you help the people of the interior. Doing so grants you rewards, not the least of which is Survival Skills, things like foraging for food or creating campfires to help you survive in the wilderness.