You would need to use the Teleport effect. Try a simple Effect - Target ability that uses a Set effect which uses two Teleport effects. One teleports the caster to the target point and the other the target to the caster point.
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Considered easy altering of the unit textures?
http://static.sc2mapster.com/content/attachments/15/252/Screenshot2011-04-17_09_16_21.jpg
For my public assets look here!
http://www.sc2mapster.com/forums/resources/data-assets/46733-the-assets-of-evil/#1

michaelknives AuthorI have been browsing the forums for help with this. I have been trying to create a targeted ability in which one unit could swap positions with an allied unit. Can anybody direct me to a tutorial on how to create a move like this?