Either this is an extremely talented model, or someone edited it afterwards because no way I'd guess this was AI generated
The latter. Looking closer at the picture it seems the artist generated the model and added some things afterwards. Look at the decoration on her costume: some of them were strangely crooked, a clear clue of them being AI-generated.
pokemon with weird/interesting lore? that would make sense for someone like rinnosuke
Rotom for the appliance forms, shiny Gigalith because he's a collector, Lugia most likely because of his connection to Yukari, Sawsbuck to check the season, Starmie because of Marisa, and Shedinja for unknown reasons
It should be the other way around - C.C. as Chisato because they're both massive teases and Kallen and Takina wouldn't know what to do with fun if it bit them in the ass.