Ferrothorn's Weaknesses

Best Counters

Ferrothorn is especially weak against Fire type Pokemon, they will deal 4x damage to it!

The types that are strong against Ferrothorn are Fire and Fighting type Pokemon.

For the best defense, Fire types have very effective defense against Ferrothorn, and will be resistant to damage from Ferrothorn's STAB attacks:

Weaknesses

Ferrothorn's type is Grass and Steel.

Ferrothorn is especially vulnerable to Fire attacks, it will receive a super effective four times (4x) the amount of damage! Since Fire type Pokemon are especially strong against Ferrothorn, you should attack with this type of Pokemon.

Ferrothorn has a weakness to Fire and Fighting types. These Pokemon types will be strong against Ferrothorn, causing Ferrothorn to take a super effective quadruple (4x) damage from Fire type attacks, and causing Ferrothorn to take a super effective double (2x) damage from Fighting type attacks.

Poison type attacks will have no effect on Ferrothorn, as Ferrothorn is immune to this type of damage! Please avoid these types of attacks.

Please keep in mind that Ferrothorn is resistant to attacks from Dragon, Electric, Fairy, Normal, Psychic, Rock, Steel, Water, Grass types, and these attacks are not very effective and cause reduced damage, so they should be avoided.