What exactly is a Desynchronization error?

[Mortisgrey]

Also is it possible for somebody to intentionally create one?

[pikachufan2164]

1.  Desynch
Symptoms:  Your opponent's deck, cards, health, and quanta keep changing rapidly.  Both players disagree about what happened.
Causes:  Various reasons.  If you lag too much, the computer will take over for you, causing problems on your opponent's end.  There is also a known bug with the PVP system.  By pulling a three man monty, and challenging each other in a triangle, all sorts of no good shenanigans happen.  Other known causes of desynch include voodoo doll shenanigans, playing flying weapon with no weapon in play, using cards that require very repetitious animation, and having a tie game.  Zanz is currently working on fixing this.  If this error occurs, post here. (http://elementscommunity.org/forum/index.php/topic,2221.0.html)

It might occur more frequently when one player has a terrible Internet connection.