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One idea I have
Ancient Type: Would be based on pokemon with ancient ties to prehistoric man as well as extinct pokemon, would replace most of their Rock and Ground and Steel typings.
With usually high Defense and Special Defense, they have an assortment of arena trap based moves that are physical. They're greatest weakness is speed.
Super Effective against: Ghost (Ancient rituals to defeat ghosts), Dark (Ruins usually hold dark secrets from the world), Dragon (Ruins trap ancient beasts like dragons)
Resisted by: Steel (as per usual), Grass, Ice
Weak to: Rock (Ruins destroyed by cave in), Ice (Ice age), Grass (Nature taking over ancient ruins)
Resists: Ground (Ruins surviving in the Desert), Water(Ruins surviving underwater, Electric (Time before electricity) Psychic (Unable to decipher ancient ways)
Willing to discuss whether or not this is viable or if its even needed