Karrablast

Clamping Pokémon ^#588

Its strange physiology reacts to electrical energy in interesting ways. The presence of a Shelmet will cause this Pokémon to evolve.

It spits a liquid from its mouth to melt through Shelmet’s shell. Karrablast doesn’t eat the shell— it eats only the contents.

- Swarm
  When this Pokémon has 1/3 or less of its HP remaining, its bug-type moves inflict 1.5× as much regular damage. Overworld: If the lead Pokémon has this ability, the wild encounter rate is increased.
- Shed-Skin
  After each turn, this Pokémon has a 33% of being cured of any major status ailment.

- No-Guard
  Moves used by or against this Pokémon never miss. One-hit KO moves are unaffected. Moves affected by this ability can hit Pokémon during the preparation turn of moves like dig or fly. Overworld: If the lead Pokémon has this ability, the wild encounter rate is doubled.

For some reason they evolve when they receive electrical energy while they are attacking Shelmet.