Everything that you need to know about Aberrations can be found here. This was figured out after a series of tedious calculations. Any questions, feel free to ask me! :)

Back to hub: http://www.furaffinity.net/view/5416923/

Oh, and unless noted otherwise...

Minor Heal=25% Damage Heal
Ineffectual=No Damage; completely immune
Mediocre damage= Damage*0.25
Minor Damage=Damage*0.5
Standard Damage=Damage*1; no change
Moderate Damage=Damage*2
Severe Damage=Damage*4
Instant Kill=100% Damage; Target is instantly Killed
Converted to Aberration/Erased from Existence=Attack does so much damage it either converts a pokemorph into another aberration or it erases an aberration out of existence.