Shelmet

Shelmet (Japanese: チョボマキ Chobomaki) is a Bug-type Pokémon introduced in Generation V. It evolves when bathed in an electric-like energy along with Karrablast. The reason is still unknown.

It evolves into Accelgor when traded for a Karrablast, which evolves into Escavalier simultaneously. Neither evolves if at least one holds an Everstone during the trade.

Its name is a combination of shell and helmet, referring to its shell resembling a helmet.

Ultimate Story

Peach had a Shelmet. She traded it for a Karrablast that Link had. Peach received a Escavalier while Link received an Accelgor from the exchange.

Gallery

Bianca's Shelmet inside its shell using Protect

Juniper's Shelmet right before it evolved after she traded her Karrablast with Bianca

Who's that Pokemon? (Black and White edition)