After a long day looking for bug types to fill out his new and improved team Bugsy ends up coming across a Shuckle desperate for a new shell, and after seeing Bugsy's exposed stomach (thanks to his unbuttoned shirt) Shuckle gets a devilish idea!
It darted right for his belly button, quickly wiggling his way inside and knocking Bugsy over in the process. After what felt like an eternity of shuckle wiggling inside his belly he suddenly stopped, but only because he was done connecting to Bugsy's nervous system. With a loud pop Shuckle's head came out of Bugsy's navel, bugsy's eyes rolling back as it happened as if he had fallen into a deep trance, and that he did as he was now nothing more than a servant to the pokemon in his belly.
A couple weeks go by and rumors spread that trainers who dare enter the azalea gym never come back, you seem skeptical so you decide to go see for yourself. you enter the gym and you see all the missing trainers! all of them with their eyes completely blank and with wiggling masses on their stomachs with a friendly little Shuckle head coming out of their navels, you get no time to react as the leader of the hive, Bugsy, challenges you to a gym battle! you better win this one unless you wanna end up like them!