The main three that are usually on my teams are Jolteon, Vaporeon and naturally, Glaceon. But not always together. I've somewhat been experimenting with my Eeveelutions, but found a fun little way of using a Vaporeon while browsing YouTube. Only problem is, it has a few weak points that people can exploit rather easily, but the person I saw using it made it work rather well, in most cases.
The rest are usually Pokemon that work well with the latter three.