Acerola

Acerola is one of the main characters of the Pokemon: New Voyage manga and anime

Alola
Mimikyu♂ Sandygast -> Palossand♀ Gengar
 * Caught before the series in Tapu Village
 * Befriended and caught in Haina Desert
 * Caught in the Hau'oli Cemetery

Sableye

Sinnoh
Shinx -> Luxio -> Luxray

Misdreavus -> Mismagius

Rotom

Drifloon -> Drifblim

Duskull -> Dusclops -> Dusknoir

Spiritomb

Johto
Pikipek -> Trumbeak -> Toucannon