Ground-type Pokemon are weak against Water, Grass, and Ice-type attacks.
The weakness of flying type Pokemon is Ice, Electric and Rock.
A dragon type's weakness is, believe it or not, is dragon type.
Water type Pokemon have the advantage.
The only weakness there is a Ground-type Pokémon.
The guy with the original answer was pretty rude and insulting, not to mention unable to spell anything. There is no sand type, there's just sand based moves, but really they're ground types. And as per usual water and grass are its weaknesses.
The weakness of electric type Pokemon is ground type Pokemon.
The weakness of flying type Pokemon is Ice, Electric and Rock.
A dragon type's weakness is, believe it or not, is dragon type.
Water type Pokemon have the advantage.
The only weakness there is a Ground-type Pokémon.
The guy with the original answer was pretty rude and insulting, not to mention unable to spell anything. There is no sand type, there's just sand based moves, but really they're ground types. And as per usual water and grass are its weaknesses.
Fairy type Pokemon are weak to Poison and Steel type Pokemon.
Electric, ice and rock type pokemon.
Ground
Ground
Ground
As of Generation 5 only the pokemon Spiritomb has no weakness because of the dual-type Ghost/Dark.