FusionDex

The gaping jaw of Swamptrum is filled with baby Remoraid for safekeeping before they grow old enough to leave. They clean its teeth and power up its Crunch by cutting through prey with sharp Water Guns.

Thanks to its gargantuan jaws, which could shred thick metal plates as if they were paper, it was invincible in the ancient world it once inhabited. If it senses the approach of a storm and a tidal wave, it protects its seaside nest by piling up boulders.