From the Azurilland Wiki, a database for the Pokémon series that anyone can contribute to
Charjabug (Japanese: デンヂムシ Denjimushi) is a dual-type Bug/Electric-type Pokémon introduced in the Generation VII games Pokémon Sun and Moon. It evolves into Vikavolt upon leveling while in Vast Poni Canyon.
→ Level 20 → → Level in Vast Poni Canyon →
| Generations I - VI
|Charjabug did not appear during the Generation I - VI games.
|Its body is capable of storing electricity. On camping trips, people are grateful to have one around.
|From the food it digests, it generates electricity, and it stores this energy in its electric sac.
Charabug is likely based off of a cocoon and a battery.
Charjabug's name appears to be based off the words charge and bug.