Uh, well you can place a grav lift ontop a dumpster, set to not spawn at start, start new round, and put a power up on the dumpster. But this wouldn't be very good.
However, if you must have it be a powerup, then use Power up in the side of a double box, where you can still grab it. It is hold a fusion coil in place (use a wall or something to keep the fusion coil from blowing away until the power up is taken, leaving an opening) and then use a man cannon to push the fusion coil. Then, set a grav lift inside the box (or whatever you use to house the switch), where the fusion coil (when set loose) will hit and explode. Set another grav lift ontop of the dumpster, and set it not to spawn at start for 180 seconds. Then, when looking at it, press X twice, and set run time minimum to 1. Go back, and set the other grav lift inside the switch to never respawn. And there you have it. When you take the powerup, the fusion coil will be pushed by the man cannon, hit a wall, explode, blow the grav lift, and make the other spawn pushing up the dumpster.
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