Synthetic. There are a whole lot of "man made" Pokémon or ones that posess / mimic "man made" items (Porygon, Voltorb, Klink, Meltan, Bronzor, Honedge, Magnemite, Chimeco, Baltoy, Sandygast, Trubbish, Litwick, Carcol, Vanillite, Sinistea, Comfey, ....) that are currently shoehorned into other categories and not always fit properly IMHO. For example, I can understand why Rotom is an electro-Type as it is basically a sentient bolt of electricity, but why is Dhelmise a Ghost/Grass type? It's a sentient anchor but somehow not a water-steel-type? And Sigilyph is a prime example of "WTH is that even" that only got shoved into the psychic-flying niche because of its attacks. Why are blobs of whipped cream and sentient keychains "fairy"? (Alcremie, Klefki) What about Unown, which are literally letters with eyes?

If there was an "this is an item that somehow learned to move" category, it would instantly have a couple dozen prime candidates, and each new gen introduces more of them (the legendaries of the newest gen are basically motorbikes, for example)