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You were close but try something along the lines of

rqt_plot /gazebo/model_states/pose[2]/position/x

As far as I can tell, the name parameter tells you what position in the pose array to find the object that you want to examine so there's no need to use it with plotting. So, with my example we'd be looking at the x position of the first_2015_trash_can object. Also, note how I'm not using the :.