Shelmet

Shelmet is a -type Pokemon introduced the Generation V games Pokemon Black and White. Shelmet evolves into Accelgor by trading it with a Karrablast.

Trivia

 * Shelmet and Karrabllast evolve only when both traders trade that Pokemon. For example, if you trade Shelmet for a Graveler, only Graveler will evolve, not Shelmet. The same is true for Karrablast. Both Shelmet and Karrablast must be traded through the same trade for them to evolve. They are the first Pokemon to do this.
 * Shelmet's Appearance resembles a knight's helmet, with the visor open.
 * It also resembles a nautilous.
 * Shelmet's name may come from Shell and Helmet.