•What is preloading (for the Nintendo Switch version)?

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• •Are there preregistration, preorder, or preload rewards?
• •Can I change the region setting once selected?
• •Can players who are playing Pokémon Café ReMix on different systems (Nintendo Switch and smart devices) register each other as friends?
• •Do I have to link my social media account?
• •Can I transfer my progress to another device?