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Should've been like this
>Under it's wood-like shell, hides the plant sap-like pokemon that holds a electrical charge thanks to it's battery-like makeup that it uses to deter against predators. Additionally, the shell is evolved to make itself look more imposing and dangerous with it's signature frown.
>Becoming stronger, it now loses it's bottom shell to allow more battery-like sap body to store even more electrical energy that allows it to deliver lethal attacks. In some cases, too much electrical energy may lead it to explode. Additionally, it also collects electrical energy from it's hardened stem that attracts lighting strikes.
Concept is all based off early batteries