Emerald hack, early game optional boss battle against "The Lunarian," a Tuxedo Mask wannabe. She has a ridiculous outfit.
>Double Battle Format, start with Lunatone and Golbat
Lunatone
>Levitate / Level 19. Starf Berry.
>Hypnosis, Dream Eater, Rock Throw, Facade
Golbat
>Inner Focus / Level 15 / Male. No Item.
>Astonish, Supersonic, Aerial Ace, Whirlwind
Dustox
>Shield Dust / Level 17 / Male. No Item.
>Protect, Toxic, Thief, Shadow Ball
Duskull
>Levitate / Level 23 / Female. Quick Claw
>Disable, Destiny Bond, Protect, Attract
Umbreon
>Synchronize / Level 18 / Female. Sitrus Berry.
>Pursuit, Iron Tail, Curse, Attract
Snorlax
>Immunity / Level 20 / Male. Chesto Berry.
>Rest, Rock Slide, Body Slam, Fissure.

Her team is based around nighttime Pokemon. Fighting her is optional but nets a Moon Stone and some XP.
Please r8 / h8