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I think a better solution would be more moves like Freeze-dry or thousand arrows, moves that have changed type matchups to more match the theming of said move. Like for example, sonic boom ignores ghost type immunity, as its supposed to be fixed damage, and a nod to 'sound type'. Solar Power could be super effective against ice types as well, since it gets boosted in the sun it makes sense thematically. This would be very overbearing to learn all these specific moves new coverage, what pokemon learn them etc, but its much better than adding a new type to the mix and fucking with the balancing.