Don't eat right before sleeping.
Gaghs and Gaghiel are same character, simply her forms are differed by eras according to canon.
All of Pokemons are dead and extinct just before Gaghs came to Xingzuo Temple and surgically converted into human, where her adoptive sister Zhima is a member of the eponymous religious community. Gaghs deeply misses her Pokemon friends, especially few ones she was forced to kill during the genocide against all of Pokemon creatures. Jeez, that's very dark and bleak stuff I've ever thinked of.