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From what I read it's not available in all PMD games, hence that's why I made that comment. If I was to make a modern or new PMD game, I'd have 40 Pokémon to choose from. 24 of them would be the regional starters from each region, including the new Galar ones. I'd then add in old favorites like Pikachu and Kanto Vulpix but I'd add Alolan Vulpix, replace Phanpy with Sandshrew(and it's Alolan cousin), have Eevee(along with a mechanism to evolve it into Sylveon), Munchlax, Skitty, Riolu, Shinx, Meowth(and it's Alolan cousin), Rockruff, Pachirisu, Axew(gasp! A Dragon starter! Thank Iris for that) and Ralts(which depending on whether it's Male or Female determines its final form).
There wouldn't be a quiz to determine your starter but merely a Random number generator that goes from 1-40. Each Pokemon is assigned a number and whatever the RNG picks is your starter if you opt to not pick outright. Then you can pick whatever partner you want. There's no type limitations so if you want two Water types(for whatever reason), who am I to prevent that. Just don't come crying to me when you run into a ton of Grass and Electric Types. Only types not represented are Bug and Ghost, although Rowlet does evolve into Grass/Ghost and some learn Bug Type moves like Jolteon with Pin Missile.