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It bugs me that fire and electricity are different types since sparks make flames and they're basically the same. combine them to heat type.
Ghost/Psychic/Dark/Fairy/Dragon combined to Mystic Type
water/ice are the same thing, one is just colder. On second thought you don't even need water since that's the same thing as Ice/Heat
steel/rock/ground as earth type
fighting shouldn't even be its own type and instead should be a class of moves like sound. change existing fighting types to Normal types that specialize in contact physical moves and work out a lot.
Grass/Bug combined to Forest type.
This should reduce everything to 7 types:
Heat/Mystic/Water/Earth/Normal/Forest/Wind
combine forest and earth into nature type now that I think about it