scott, I was just thinking, sabrina's alakazam's attack says you may not use
the attack next turn, however, if you have another sabrina's alakazam on your
bench, may you use it's attack, or does the attack say you cannot use it next
turn what so ever? I would like to know the answer very much!

- ANDY

The attack says that during the next turn, you may not use "Mega Burn".  This means that even if obtained using a Pokemon Power, Sabrina's Alakazam could not use any attack named "Mega Burn" whatsoever during the next turn.

Scott