User blog comment:BannedLagiacrus/Monster Appreciation Week: Brachydios(4th Gen)/@comment-25231613-20150907120737/@comment-4502434-20150909035920

I'm curious as to how a brachidios might swim. Rain is one thing, but completely surrounding yourself in water is another.

I think it's a stretch to say it's not possible, but it would probably weaken the beast for a while. Give it the wyvern equivalent of a cold.

Still, I think the reason Brach is weak to water is not necessarily because of it's shell, but because the water disrupts the slime, and washes it away. It would make sense for fire to burn it off too, but that's not the case. Or I'm thinking into it too much.