Candy Genius is one of the three skins released in the third part of the Freakin Sweet Shop offer. It could be purchased as part of an item deal for a limited time in late April 2018.
Candy Genius could be purchased for $14.99 in the limited time "Best Deal!" which included 25000 coins, 1200 (1800 on browser) DNA, a Triple XP Boost and a Double Mass Boost. This skin was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The third part of the Freakin Sweet Shop offer has been released multiple times after the initial 2018 debut. Additional limited time releases were in mid December 2019 and then in early May 2020. Candy Genius could again be purchased for $14.99 in each of these releases. It also included 25000 coins, 1200 DNA, a Triple XP Boost and a Double Mass Boost on both browser and mobile.