Killer Instinct

This solution is a little long but once everything is set up it's touch and go.

First of all you will need the following:

1. PC with windows 10 that can run KI at least in the lower settings;
2. KI downloaded and installed on your PC;
2. A dummy account; and
3. Not exactly necessary but 2 controllers would help.

Ok, first log in ONLY your dummy account on your xbox one (it will have gold privileges because of the main account).
Log in with your main account on your PC.
Start KI on the console and on the PC.
Go to ranked matches and start searching with the dummy account and after 5 seconds with the main account (don't ask me why, but this seems to make a difference).

Using this method I was getting matched up with myself most of the time, specially during times when there are fewer players, like 2am, I got as much as 10 figths in a roll.

Whenever you get a random, hopefully it will be with the dummy account.

This method also can be used to boost yourlself to Killer, but it will tak a very long time, specially if you keep getting randoms and losing, I'm almost at Gold already.

I'm still experimenting with this method, and I think it can be improved, so if you have any suggestions just say so in the comment section.