Breloom's Weaknesses

Best Counters

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

The types that are strong against Breloom are Flying, Fairy, Fire, Poison, Psychic type Pokemon.

For the best defense, Flying, Poison, Bug types have very effective defense against Breloom, and will be resistant to damage from Breloom's STAB attacks:

Ice types will also deal super-effective damage against Breloom, but be careful using Pokemon of this type because they may also receive extra damage from some of Breloom's attacks!

Weaknesses

Breloom's type is Grass and Fighting.

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

Breloom has a weakness to Flying, Fairy, Fire, Ice, Poison, Psychic types. These Pokemon types will be strong against Breloom, causing Breloom to take a super effective quadruple (4x) damage from Flying type attacks, and causing Breloom to take a super effective double (2x) damage from Fairy, Fire, Ice, Poison, Psychic type attacks.

Please keep in mind that Breloom is resistant to attacks from Dark, Electric, Grass, Ground, Rock, Water types, and these attacks are not very effective and cause reduced damage, so they should be avoided.