Well, I used a 0 SAtk Tinted Lens Yanmega on Showdown with LeBoss.
- When Yanmega spammed Bug Buzz on a Skarmory, it did about 25%.
- When Yanmega spammed Bug Buzz on a Skarmory that just Roosted, it did about 50%.
So Tinted Lens does not quadruple the power, it just doubles the power.