GroundBug
Ground and Bug types: weaknesses, resistances and Pokémon
Ground and Bug Pokémon take double damage from Fire, Water, Ice and Flying moves, resist Fighting, Poison and Ground moves and are immune to Electric moves.
The balance is even: 4 weaknesses and 4 resistances or immunities.
Ground moves are super effective against Fire, Electric, Poison, Rock and Steel and not very effective against Grass and Bug. Bug moves are super effective against Grass, Psychic and Dark and not very effective against Fire, Fighting, Poison, Flying, Ghost, Steel and Fairy.
To beat these Pokémon, your best pick is Fire, Water and Ice moves. Avoid Fighting, Poison, Ground and Electric moves, which deal little or no damage.
There is 1 Pokémon with this combination, such as Nincada.