The Ability Doubler can only be attained on a Splatfest Tee.
☆ NintendObs Weekly – Monday, July 10, 2017 – Sunday, July 16, 2017.
This is a special Gear Ability that can only be attained on a Splatfest Tee. It doubles the effect of other abilities.
— Squid Research Lab
Source: Splatoon’s Tumblr.
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