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The only two that ever made sense to me were Light and Sound
Light Type
>Super Effective vs Dark, Ghost, Bug, and Ice
>Resists Itself, Ghost and Ice
>Weak to Dark and Steel
>Resisted by Fire, Water, Grass, and Steel
Example moves:
Laser, Special, 60BP, never misses
Photon Beam, Special, 90 BP, 10% to lower SP. Def
Atom Bomb, Special, 130 BP, 90% acc, 25% damage dealt as recoil
Glitter Bomb, Physical, 80 BP, 30% Chance to flinch
Sound Type
>SE against Psychic and Water
>Resists Fighting and Psychic
>Weak to Ghost and Bug
>Resisted by Ground, Rock, and Steel
Many sound based moves such as Hyper Voice, Boomburst, Roar, and Supersonic are now sound type. Soundproof also acts as an immunity to sound type moves.
Example Moves:
Blurt, Physical, 40 BP, Always goes first
Shockwave, Physical, 90 BP, 95% acc, Hits all other Pokemon on the field
Piercing Shriek, Special, 75 BP, Always lands a critical hit