>>38158306Ghost and Bug were both supposed to murder Psychics. The problem was that Bug had no moves outside of Twineedle, which was exclusive to Beedrill (Who, if his stats weren’t irredeemable garbage, might have actually had a niche).
Ghost was in the same boat. Super effective against Psychics, physical (meaning it would be better against psychics who tended to have lower defense and HP), etc. Unfortunately there were really no effective Ghost moves (Lick was always shit) and the only Ghost Pokémon that existed at the time was weak to Psychics, had poor Attack (massively special but attack would have been preferable to Ghosts in Gen 1) etc.