How can I best exploit Rathian's weaknesses in Monster Hunter Stories?

Use Thunder - element weapons to best exploit Tigerex's weakness.

Equip water or ice weapons and use attacks related to those elements.

Use Ice - based weapons and attacks.

Equip Ice - element weapons to exploit Rajang's weakness to Ice.

To best exploit Basarios' weaknesses in Monster Hunter Stories, first, equip water - based weapons. These will deal extra damage due to its water weakness. Also, try to stay close to its underbelly when attacking as it's a vulnerable area. And don't forget to use items that can inflict status effects like poison, which can further weaken it during the fight.

To exploit Barroth's weakness in Monster Hunter Stories, use water - based attacks. You can equip water - element weapons or use Monsties with water - type skills.

Use fire - based weapons or skills to target its weakness.

Use ice - type attacks and aim for its legs.

Rathian is also relatively vulnerable to attacks on its head. Hunters should aim for this area when possible to deal more damage. Additionally, it has a weakness to certain status effects like poison, which can gradually deplete its health over time.

Use Thunder - based weapons to take advantage of its elemental weakness.