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Challenge: create a thematic hidden ability for Regigigas that still functions as a nerf, but isn't as crippling as Slow Start
>Slumbering Titan
>Regigigas gains the sleep status whenever it is sent into battle, which lasts for 2 turns before it wakes up naturally.
You would be able to counter it by using a chesto/lum berry to wake up immediately, at the cost of Regigigas not being able to use any other held items, and with the risk of being put back to sleep if you have to switch out and switch back in.