If there were to be new types of Light and Sound. Here is what I think there matchups would be
Types weak against sound
Ground: Soundwaves can cause the ground to break apart
Rock: Same reason as ground
Fire: Sound blasts can put fire out since sound it just a pressure wave
Psychic: Its hard to concentrate with lots of noise
Ice: Ice shatters under pressure and sound is pressure
Sound: Sound type pokemon would be sensitive to sound just like Sound matoran, toa, and turaga
Types that resist sound
Fighting: Fighters thrive on the cheering of fans
Flying: Flying can break the sound barrier
Bug: Bugs are very noisy
Water: Sound bounces off water like ripples in a pond but goes back to its original shape
Dragon: Dragons roar loudly to scare foes so sound won't affect them
Types sound is weak to
Fighting- Music only makes fight scenes more powerful
Flying- Flying breaks the sound barrier
Bug- A bug in the system make your sound equipment not work
Ghost- Parnormal energy messes with sound equipment
Types weak to the light type
Fighting: Can't fight if you can't see
Flying: Can't fly if you can't see
Ghost: Light drives back the evil spirit
Water: Light evaporates water
Ice: Light will melt ice
Dark: Light pushes darkness back
Types that resist the light type
Normal: Many normal types are day creatures
Bug: Bugs thrive in light most even flock to it
Grass: Plants thrive in light
Electric: Electricity comes from light
Types Light is weak to
Normal: Most normal types are day creatures
Bug: Bugs thrive in light
Grass: Plants thrive in light
Dark: Darkness pushes light back
If anyone has any input on how to make this more balance let me know