NormalFairy
Normal and Fairy types: weaknesses, resistances and Pokémon
Normal and Fairy Pokémon take double damage from Poison and Steel moves, resist Bug and Dark moves and are immune to Ghost and Dragon moves.
The balance is even: 2 weaknesses and 4 resistances or immunities.
Normal moves are super effective against no type and not very effective against Rock and Steel. Fairy moves are super effective against Fighting, Dragon and Dark and not very effective against Fire, Poison and Steel.
To beat these Pokémon, your best pick is Poison and Steel moves. Avoid Bug, Dark, Ghost and Dragon moves, which deal little or no damage.
There are 4 Pokémon with this combination, such as Jigglypuff, Wigglytuff, Igglybuff and Azurill.