After becoming the champion of Sinnoh a few weeks ago, you went back to Jubilife City to kick back and relax but when you got there, you saw a giant blob of squishy softness crushing the city. It was Cynthia, the woman who you beat in a Pokémon battle and now she was massive.

Cynthia: Hey, there cutie! I'm so glad that you came to see me again, hehe~