Since
Grubbin is a Bug-type Pok--mon, the best Pok--mon to face are Grass, Dark, and Psychic-type Pok--mon. Once your
Grubbin is level 20, it will
evolve into Charjabug. Go to Vast Poni Cavern. Level up your Charjabug there, and it will
evolve into Vikavolt.
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