Voltorb in depth
Biriridama, the noise before the blast
The Japanese name, ビリリダマ, combines the onomatopoeia for electrical crackling with the word for “ball”. It's a name that sounds like what it does: first the crackle, then the problem. The English name, Voltorb, is duller and more direct — volt and orb, an electrical unit and a sphere — and it's the one used unchanged in Spanish.
The design belongs to that first-generation batch where an everyday object simply becomes a creature, with no further explanation. Here, the object is the game's own tool, creating a joke that only works on screen: when the player sees a ball on the floor of the Power Plant, they don't know whether they're about to pick up an item or eat an explosion.
An explosive put together wrong
Voltorb is a clean example of a Pokémon whose two ideas don't fit together. Idea one is exploding; idea two is running. Exploding calls for physical Attack and enough bulk to stay alive until the right turn, and it has neither: 30 and 40. Running calls for something to do with that initiative, and with 55 Special Attack the answer is not much.
Compared with Pineco, the other explosive artefact in the old Pokédex, the difference is in the distribution: Pineco can take hits and hit hard, while Voltorb only gets there first. In a normal playthrough that is still worth something, because Self-Destruct at level 26 takes out almost any opponent at that point in the game, and with Aftermath equipped the calculation still works even when it is the one that dies.
Its other role, a quieter one, is support. Eerie Impulse at level 6, Light Screen at 29, Magnet Rise at 34 — which cancels its weakness to Ground for five turns — and Electric Terrain via TM make up a support movepool much longer than its stats would suggest.
Wooden balls and other revisions
The biggest revision came with its Hisuian form, which is Grass- and Electric-type. The joke is rewritten backwards there: if modern Voltorb imitates industrial Poké Balls, Hisuian Voltorb imitates Apricorn Balls, the ones made from hollowed-out fruit, and is full of seeds inside. Its mood changed too. The original is a bundle of nerves; the Hisuian one is described as cheerful and excitable, though it still lets off discharges when it gets excited.
The smaller changes accumulate quietly. Its base friendship rose from 50 to 70 in Generation VIII, an adjustment it shared with a large part of the Pokédex. Its distribution across the games has followed the cables: Route 10 and the Power Plant in Kanto, the Safari Zone and Team Rocket Hideout in the second generation, Mauville City in the third, Route 218 in the fourth, and mines and towns in Pokémon Scarlet and Pokémon Violet.
And then there's Voltorb Flip, the Pokémon HeartGold and Pokémon SoulSilver minigame that turned the ball into a casino puzzle: a board of numbers where the wrong tile ends the game. It's the only time a Pokémon with 330 base stat points has had its own game within the game.