What fish get along with goldfish?

Goldfish are best with goldfish, but you can have weather (dojo) loaches, or bristlenose plecos, or even Apple or mystery snails.

While there may be a number of varied opinions on this, and some fish keepers may have had lucky success with other typically incompatible fish in their tank, this is not the standard or proper recommendation.
There are quite a few species of coldwater fish that can live alongside Goldfish. There are Golden Orfe, Blue Dace, Rudd and several species of catfish too. Check with your local pet shop what coldwater species they have available on their lists.