I can speak from my own experience in having a toothless elderly cat.
They adapt. My cat eats dry food still, as he did before. He has no problems.
My vet advised me that if I do see him encountering problems, I could change him to a wet-food diet, or soak his dry food in water, to soften it, before feeding him. I would recommend speaking to a vet about this, as the breed may have specific dietary requirements, foods available from supermarkets may not be sufficient, and you may need to get a specialised diet from the vet.
Another issue they may encounter would be in defending themself against attackers. But, this being a Pomeranian, I doubt that not having teeth would add much to the existing size disadvantage they already have against other dogs.
In short, I don't see the missing teeth being an obstruction to adopting this animal. They can live a full, healthy, and happy life with you.