[Kawahagitei] Mei no Shikyuu wa Master Ball!! Jutai Hokakuritsu 100% Gensen Sagyou de Meippai Umu! | Rosa's Womb Is A Master Ball! Laying Lots Of Eggs With 100% Catch And Fertilization Rate IV Breeding! (Pokémon) [English] [Solas]
Lots of things going on here, but my main takeaway is that Rosa's clothes are part of her body, her being, except for her bra, which is a held item she has to put on.
If in alt ending or beginning of story of team plasma trying convincing the trainer they merge ditto dna and her to she part pokemon if team plasma use Pokémon to catch trainer that is part Pokémon already is my suggestion for alt ending or part 2