User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4411728-20130423232152/@comment-4411728-20130426011436

He's second weakest to water while in normal form and recieves slight damage when his colour changes. Ice does no damage when his colour changes. The best element overall would be either water or dragon, but because the fight is so long, the tolerance level of slime gets built up to the point where in the long run element based weapons will outdamage slime.