What is the difference between tiny toy, teacup, pocket size, regular yorkies?

The difference is how badly you want to get riped off. There is ONE standard for a yorkie. If the breeder is striving for it, don't buy form them.
Find RESPONSIBLE breeder. A responsible breeder will:

1) be breeding to the breed's standard..no teacup, micro, mini, imperial,
king, or other goofy term for runts or oversized dogs. No intentional
"rare", meaning unaccepted by the breed standard, colors either.

2) will be actively showing or working the parents.

3) will have genetic health testing done, such as OFA or PennHip, CERF,
VonWillebrand's, etc.

4) will give you the results of that testing in writing

5) insists on spay/neuter for pet pups.

6) has a contract citing the spay/neuter clause and also offering to take
back the pup at any time for any reason for the rest of its life.

7) is open, honest, and available to the new owner, and can talk aobut their
breed for hours.

does a home check before placing a pup, and will turn down homes that
might not be suitable for a pup of their breed.

9) does not put money above the well-being of their animals.

If the breeder you are considering doesn't fit these guidelines, fond a
better breeder. You are more likely to get a mentally and physically
healthier pup from a responsible breeder.
References :
Rescuer, vet tech, groomer and show exhibitor of Shetland sheepdogs for 20+ years.

Yorkies come in ONE size. O.N.E. All of the other terms you mentioned at complete crap. They are huge red flags that you are looking at a poorly bred runt from a BYB that couldnt care less about her animals. These BYBs are TRYING to TRICK you into paying more for a dog. PLEASE do more research and dont fall for their scam!!
References :

The difference: The fancier names are from puppy mills, or 'Designer Doggie breeders'.

NEVER buy a tin toy, teacup, ect yorkie because they will have genetic problems.

hope this helps. and about the breeders, look at your humane society or rescue group, but you probily want to get one from a breeder..so get one with an CKC or AKC registered.

Welcome.!
References :

None of those "sizes" are real. There is ONE breed standard for the Yorkie. http://www.akc.org/breeds/yorkshire_terrier/index.cfm
References :

Yorkies come in one size -between 4 and 7 lbs.

The only way to find a yorkie for that price is to go to a breed rescue or look on petfinder.
References :

There is no difference. All of those words are used by BACK YARD BREEDERS or PUPPY MILLS to somehow make their puppies seem unique or special. If someone is trying to sell you a "teacup yorkie" or a "tiny toy" or "pocket size" yorkie, walk away. Only buy from reputable breeders and reputable breeders do NOT use those kinds of words to promote their pups. There is only ONE size of Yorkshire Terrier.

Try breeders.net
References :

Thay are all differnet sizzes, but technically there just one size. They just diecided to name different sizzes for one size.

And if u want a full breed yorkie for that much I doubt that that will happen. Full breeds are always the most expensive.
References :

The only thing I can add to what everyone is telling you is DITTO!!!
References :

The difference is the quality of the breeder. No responsible breeder labels their yorkies with "tiny toy, teacup, pocket size".

You are unlikely to find a well-bred yorkie for the price you are looking for. Buying a cheap, poorly bred dog, especially one that someone has been selectively choosing for smaller and smaller, is a great way to rack up huge vet bills which will be far MORE costly than just paying more to a responsible breeder with a more healthy dog.
References :

The difference is greed and breeders buying into the desire for itty bitty dogs that look cute in a doggie purse! The difference is the overall health of the dog as runts are bred with runts to get the smaller sizes. The smaller the dog the more risk of internal organ problems. We rescue all these small breed dogs from puppy mills. Folks cannot believe how big the Yorkies are supposed to be and no one wants to buy the big ones. This is true of most all of the smaller breeds dogs. It is about silly vain people and what they will pay for these poor badly bred dogs.

Go to petfinder.com and look for that breed rescues and save a life!!!
References :
St. Francis Animal Rescue

The only one that is a true breed is just a yorkie. The others are just made up names by unscrupulous breeds. It would be almost impoosible to find a nice yorkie under $500.
References :

There is only one size.
References :