Yes there is nothing cuter than a puppy, but that ends quickly and you have to train them and they have energy... blah blah blah too much work. I want a dog who is just happy to sit and chill, maybe a walk and a bit of fetch but for the most part just wants to chill and be lazy/loved. About what age do dogs stop having tons of energy or what type of dogs. Also, are dogs from the pound moderately trained? I would prefer not to train it either.
My breed, Komondor, fits the bill for lazy. They were bred to lay with their flock of sheep to protect them, so that is all they do. They lay around and protect their "human" flock. However, they do not play nor do they fetch unless trained to fetch. (no prey drive whatsoever.)
However, they absolutely do not fit the bill for not needing any training. Because they are a guard dog, they need constant training throughout their lives. No training = dangerous dog.
Unless you spend the big bucks for a fully trained dog from a trainer, there isn't going to be a dog out there that doesn't need some training. Shelter dogs may or many not have basic obedience, but you will still need to do some of your own training to establish you as the pack leader and to teach the dog what your house rules are.
If you want an extremely well trained dog, you could always put your name on the service dog waiting lists. They occasionally have dogs that are extremely well trained, but couldn't cut it being a service dog. However, know that getting one of them is a long wait as the puppy raisers always have first dibs on "their" puppy. You also have to pass a rigorous home check to get one.
But if you are going to get a dog, I would plan on definitely having to at least having to do basic obedience training. Dogs are a lot of work. To be a successful idog owner, you have to commit to putting time and energy into your pet. A dog is much like a toddler in the amount of care and teaching it needs. There is not a breed in existence where you can just bring it home and just let it exist in your house for the rest of their lives.