Black: When attacked, it defends itself by closing the lid of its shell. It can spit a sticky, poisonous liquid.
White: It evolves when bathed in an electric-like energy along with Karrablast. The reason is still unknown.
Black-2: When it and Karrablast are together, and both receive electrical stimulation, they both evolve.
White-2: When it and Karrablast are together, and both receive electrical stimulation, they both evolve.
X: When it and Karrablast are together, and both receive electrical stimulation, they both evolve.
Y: It evolves when bathed in an electric-like energy along with Karrablast. The reason is still unknown.
Omega-Ruby: When it and Karrablast are together, and both receive electrical stimulation, they both evolve.
Alpha-Sapphire: It evolves when bathed in an electric-like energy along with Karrablast. The reason is still unknown.
Sword: When attacked, it tightly shuts the lid of its shell. This reaction fails to protect it from Karrablast, however, because they can still get into the shell.
Shield: It has a strange physiology that responds to electricity. When together with Karrablast, Shelmet evolves for some reason.