well, the strongest akuma possibly versus three legendary pokémon... cyber akuma is VERY, very tough... but can he take three legendary birds with enormous stamina and elemental forces??
SAT
SaTsuJiNWielder of Thunder Seal
well... 'cyber' would hint that he's weak vs electricity and water
so I think all you'd need is zapdos
I dont think thats the strongest akuma though
THE
The-JudgeRestricted
hmmm... i cant think of a stronger akuma... anyways... i dont think he is directly weak against electricity or water, but it would hurt him, i think... but it takes raw power to take down cyber akuma...
MES
MesirusInfomation Trafficer
articuno could freeze him, zapdos souns burn out his curcuits and moltres could heat him so that he is vunerable to pyhsical attacks