Player A has Ampharos in play. Player B plays a holon mentor to get three basics. At what point can player A put damage counters on player B's pokemon? Immediately after the supporter is played? After player B decides to put down more bench pokemon? Let's say player B lays down his three basic on the field to show his opponent which basics he played, then immediately slides them onto the bench position. Would jamming put damage counters on the three new basics? I would say Jamming only puts counters on the pokemon in play prior to the supporter being played.