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Goldfish tend to grow to be quite large, especially the pond-friendly comets, which are capable of reaching around 10 to 12 inches in length. Depending on your winter climate, and it sounds like you already plan to bring the fish inside for the winter, you will need quite a large holding tank to keep them in during those colder months. If your pond is dug at least three feet deep in one section, the fish will have a place to go when the pond freezes as the pond shouldn't freeze that deep. Goldies will hibernate when it turns cold, so they won't move much, nor will they eat much. They will likely just stay in one random position for most of the winter, so if your pond is deep enough you won't need to bring your goldfish inside at all. Some people like to maintain an air hole in the ice and that can be done with a floating heater, or the ice itself will probably store enough oxygen in bubbles just beneath it to keep hibernating fish alive for months. Also, your pond should have at least one section that is a bit shaded from the direct sunlight in the summer, so digging the hole beneath some nice big trees can help to give the fish a respite from the hot sun. It also helps to plant water lilies or other plants in there to give the fish something to hide beneath to get out of the sun. I disagree that 50 gallons is only room enough for two goldies, but if you desire more than two, I would get the fancy type, such as orandas, as they grow more slowly and never get quite as large as the comets. Also, the fancies do best when indoors as they are slow swimmers, so keeping them outside only in the summer is a good idea, but make sure the pond is deep enough that predators can't easily catch them. Again, around 2 to 3 feet in the deepest section would be best for that purpose.
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