Do the six damage counters for Beheeyem's "Damakinesis" attack have to all come from the same Pokemon, or can I move a total of six from multiple Pokemon I have in play?
You can choose as many Pokemon as you have in play, moving a total of six damage counters. If you have less than six damage counters on all your Pokemon in play, you move all of them.
Source: Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)

Relevant cards

Note: All applicable cards may not be listed below.
BW8_70