It depends on your hero. Make it something your hero is good at.
Or, if you don't have a hero, make the weakness a fear, as many villians are all about the fear they instill in others.
Or make it the opposite of the villian's power.
Chat with our AI personalities
Ice is Altaria's greatest weakness. It is a Dragon/Flying type and Ice is super effective to both.
Both. If your attack is good against another pokemons TYPE then it will be super effective. If your pokemons type resists their attack then it will be not very effective. Water attack is super effective against fire.
It is bug and fighting are super effective on dark types.
The weakness to grass is ice, fire, bug, and poison
He dos not really have a weakness but if your of the screen you can dodge his wing atack thing and hit him like a ton.