Grubbin evolves into Charjabug starting at level 20. This evolution process is straightforward and relies purely on experience point accumulation. Once Grubbin reaches this threshold, the transformation occurs automatically unless an Everstone is held or the evolution is manually cancelled. However, the path from Charjabug to the final stage, Vikavolt, involves more specific requirements that have shifted across different game generations.

Understanding the Grubbin Evolution Chain

The Grubbin family represents one of the most distinctive Bug-type lines introduced in the Alola region. Unlike many early-game Bug-types that evolve quickly and fall off in utility, this line boasts a massive Special Attack stat in its final form.

Stage 1: Grubbin to Charjabug

Grubbin is a pure Bug-type larva. Its primary role in the early game is to reach level 20. In modern titles like Pokémon Scarlet and Violet or Pokémon Sword and Shield, reaching this level is relatively fast due to shared party experience mechanics. Using Exp. Candies obtained from Tera Raids or Max Raid Battles can bypass the traditional grinding process entirely. At level 20, Grubbin gains the Electric typing upon becoming Charjabug, significantly altering its defensive profile and move pool.

Stage 2: Charjabug to Vikavolt

The second evolution is where mechanics vary. In the original Pokémon Sun and Moon, Charjabug only evolved when leveled up within a Special Magnetic Field (such as Blush Mountain). In contemporary titles, the process has been simplified: exposing Charjabug to a Thunder Stone triggers the evolution into Vikavolt at any level. This change provides much-needed flexibility, allowing trainers to obtain a high-tier Special Attacker much earlier in their journey.

Where to Catch Grubbin in Current Games

Finding a Grubbin depends heavily on which region you are currently exploring. As of 2026, players primarily encounter this species in the following areas:

  • Paldea (The Teal Mask DLC): Grubbin is abundant in the Kitakami region. Look in the Apple Hills and Kitakami Wilds. They are often found near trees or wandering the grassy plains.
  • Galar: In Sword and Shield, Grubbin appears as a common encounter on Route 1 and in various sectors of the Wild Area, such as Dappled Grove and Watchtower Ruins, specifically during rain or thunderstorms.
  • Alola: For those revisiting the seventh generation, Route 1 and Route 4 remain the primary habitats.

Base Stats and Performance Analysis

To understand why the Grubbin evolution level is a frequent search query, one must look at the competitive payoff. Vikavolt is not a typical "Route 1 bug."

Stat Grubbin Charjabug Vikavolt
HP 47 57 77
Attack 62 82 70
Defense 45 95 90
Sp. Atk 55 55 145
Sp. Def 45 75 75
Speed 46 36 43
Total 300 400 500

The jump to 145 Special Attack puts Vikavolt in the same tier as many Legendary Pokémon. However, the trade-off is its Speed. Charjabug actually becomes slower upon evolving from Grubbin, and Vikavolt remains a very slow combatant. This makes the line ideal for Trick Room teams or as a pivot using Volt Switch.

Optimized Training for Vikavolt

Reaching the evolution level is only the first step. To maximize the potential of the Grubbin line, specific natures and effort values (EVs) are recommended.

Nature Selection

  • Modest (+Sp. Atk, -Atk): This is generally considered the standard for Vikavolt. It leans into the Pokémon's highest stat, making it a terrifying wall-breaker.
  • Quiet (+Sp. Atk, -Speed): Preferred for Trick Room compositions where moving last in the normal priority bracket is an advantage.

EV Spread For a standard offensive build, 252 EVs in Special Attack and 252 in HP are advisable. This maximizes bulk, allowing Vikavolt to take a hit before retaliating with a devastating Thunderbolt or Bug Buzz. Since its base speed is too low to outpace most threats even with maximum investment, focusing on durability is often the more pragmatic choice.

The Utility of Charjabug and the Battery Ability

It is a mistake to rush through the Charjabug stage without considering its unique niche. Charjabug possesses the ability "Battery," which raises the power of allies' Special moves by 30%. In Double Battles, a level 20+ Charjabug equipped with an Eviolite (to boost its Defense and Special Defense) can be a more valuable support piece than a fully evolved Vikavolt. This utility is a key reason some players delay the final evolution.

Competitive Movepools in the Current Meta

Upon hitting the Grubbin evolution level and moving up the chain, several moves become essential for your kit:

  1. Sticky Web: Learned by Grubbin/Charjabug and retained by Vikavolt. This entry hazard is vital for speed control, slowing down any grounded opponent that switches in.
  2. Volt Switch: Allows Vikavolt to deal heavy damage while pivoting to a safer teammate, mitigating its low speed.
  3. Bug Buzz: A high-accuracy STAB (Same Type Attack Bonus) move that can bypass Substitute.
  4. Thunderbolt/Thunder: The primary Electric-type offensive options. Under rain, Thunder becomes a 100% accuracy nuke.
  5. Energy Ball: Provides crucial coverage against Rock and Ground types that otherwise threaten the Bug/Electric typing.

Evolution Methods Across Different Versions

For trainers playing older or specific regional versions, the requirements can be confusing. Here is a definitive breakdown:

  • Generation 7 (Sun/Moon/Ultra Sun/Ultra Moon): Level up Charjabug at Blush Mountain (Ula'ula Island) or Vast Poni Canyon.
  • Generation 8 (Sword/Shield): Use a Thunder Stone on Charjabug at any level. The Stone can be found at the Lake of Outrage or purchased from certain NPCs.
  • Generation 9 (Scarlet/Violet - DLC): Use a Thunder Stone on Charjabug. These are easily obtainable at Delibird Presents shops once you have enough gym badges.

Shiny Hunting the Grubbin Line

The Grubbin line features one of the most celebrated Shiny palettes in the game. The standard reddish-brown and orange of Grubbin transitions into a sleek, metallic silvery-white and lime green for Vikavolt.

In 2026, the most efficient way to hunt for a Shiny Grubbin is through Masuda Method breeding or Outbreak hunting in the Kitakami region. Using a Bug-type or Electric-type Sparkling Power sandwich increases the odds significantly during an outbreak. Given that Grubbin evolves at level 20, you can quickly verify the shiny status of the entire line within minutes of hatching or catching.

Tactical Advice for Gym Challenges and Raids

Using a Vikavolt effectively requires understanding its typing. Being Bug/Electric, it only has two weaknesses: Fire and Rock. Conversely, it resists Fighting, Steel, Grass, and Electric, while its Levitate ability gives it a complete immunity to Ground-type moves—a rarity for an Electric type.

In Tera Raids, Vikavolt excels as a Special Attacker when the raid boss is weak to Electric or Bug. However, because of its low speed, it often takes damage first. Equipping a Shell Bell can help maintain HP throughout the raid. If the Grubbin you caught has the Swarm ability, it will transition to Levitate upon becoming Vikavolt, which is arguably one of the best defensive abilities in the game for this specific type combination.

Frequently Asked Questions

Can I evolve Charjabug into Vikavolt at level 20? Yes. As soon as Grubbin evolves into Charjabug at level 20, you can immediately use a Thunder Stone to reach the final stage. There is no minimum level requirement for the second evolution.

Does Vikavolt lose any moves if I evolve it too early? In modern games, no. Most moves can be relearned via the "Remember Moves" function in the party menu. However, it is always wise to check if Charjabug learns a specific utility move earlier than Vikavolt through leveling.

Is Vikavolt better than other Electric types like Jolteon or Magnezone? Vikavolt serves a different purpose. While Jolteon is a glass cannon speedster, Vikavolt is a bulky tank. Compared to Magnezone, Vikavolt lacks the Steel typing's resistances but gains Ground immunity through Levitate, which is often a decisive factor in battle.

Conclusion on Grubbin's Growth

Mastering the Grubbin evolution level is a foundational step for any trainer looking to add a powerhouse to their roster. By reaching level 20 and securing a Thunder Stone, you transform a humble larva into one of the most aesthetically pleasing and tactically unique Pokémon in the modern pokedex. Whether you are navigating the competitive ladder in 2026 or simply completing your regional collection, the Vikavolt line remains a high-value investment for any team.