Requested by @this-is-where-the-fish-live and anonymously
Grubbin and Charjabug are the early life stages of the seventh-gen beetle Vikavolt. While Vikavolt is a powerful electric cannon (which we’ll examine tomorrow), Grubbin has no electric power at all: not even an electric typing. How does this baby-bug grow into its electric powers? That’s what we’re here to examine today.
Grubbin is quite obviously a grub, the larvae stage of many beetles. Specifically, Vikavolt appears to be a stag beetle, with it’s large mandibles. Beetles, like butterflies, go through their lives in different stages: They hatch out of the egg as a larva, and then become pupa (the cocoon equivalent), before magnificently transforming, metamorphosing, or evolving into a full beetle.
Like caterpillars, beetle larva (grubs) eat a lot so they can grow quickly. Instead of leaves, stag grubs feed on rotting wood. Just like the pokédex says, their claw-like jaw mandibles let them scrape wood so they can eat it. They usually live underground, because the richest rotting wood is buried in the soil.
Charjabug, on the other hand, does not really resemble a grub or a beetle at all. Charjabug seems to be based on a caterpillar, the japanese Monema flavcesens, also known as the Denkimushi, which translates to “electric insect”.
These caterpillars are infamous for giving “electric shocks” when they are touched. In reality, there’s no electricity involved: they simply have a poisonous toxin, chemicals that happen to feel like an electric shock. They generate these chemicals from the food they eat, so it certainly seems a good fit for Charjabug…except considering Vikavolt, Charjabug must use actual electricity.
There is one bug that uses an electricity. It’s not a caterpillar, or a beetle. It is a wasp. The Oriental Hornet has mini solar panels embedded into its abdomen. Its yellow stripes collects energy from the sun and turns it into electricity, which the hornet stores like a battery.
Like Grubbin and Vikavolt, these bugs don’t develop this electric power until they reach their adult life stage. Speficially, the pigments in its exoskeleton are structured and layered to capture light, breaking sunlight apart into smaller rays which can be used to create electricity by knocking off electrons (see Heliolisk). These electric pigments has only ever been document in these hornets, but has been theorized in other bugs, from butterflies to beetles. This is probably the method Charjabug uses! Little cellular batteries, like an eel’s electrogenic cells (see Tyanmo) could be used to store the energy that Charjabug generates.