Trading Places: When Adaptoid hits a single-base character with a close combat attack, after actions resolve Adaptoid and the hit character may be placed in each other's squares.

Does the attack have to damage the target for Adaptoid to use Trading Places?
No. The attack must hit, but damage is not required. It is perfectly acceptable for Adaptoid to attack a character that it can't damage so that it might simply use this power to reposition the target.