Aquarius is a Zodiac themed skin that was included as part of the monthly release of the Star Pack offer. The series of Star Packs is collectively known as the Zodiac Monthly Deal. The Star Pack with the Aquarius skin was available for purchase for a limited time in mid January 2018.
Aquarius and a package 800 DNA could be purchased for $4.99 as part of this Star Pack. This skin was not available for individual purchase and may not be available for purchase in the future.
Details of this offer may vary depending on location and platform.
Note: The Star Pack with the Aquarius skin was released again for a limited time in mid January 2019. This time it cost $4.99 and included a package of 16000 coins.