NIMBY!
No, wait. Yes, in my back yard. Given the tech to move it (a rather large given), I'd shove it into an orbit very near our own. Not the same one, in case of some kind of drift, but maybe a half million miles or so in or out. It would have to be far enough so its gravity wouldn't perturb the Earth or the Moon's orbit during passage. I'm not doing those numbers.
Maybe the same orbit would work. I have no idea if planets "walk" along their orbits at all or not. I don't think so.
Terraform that, and you've got a sister planet just a hop away (at certain times).