Voltorb is card #44 of 146 in XY (2014), a Common illustrated by Atsuko Nishida. At about $1.47 it is the #55 most valuable card in the set. In a XY booster it turns up about once every 9 packs. It is one of 40 Voltorb cards printed so far.
1999Base Set
2003Skyridge
2007Secret Wonders
2012Boundaries Crossed
2014XY
2016Evolutions
2019Hidden Fates
2023151

















An ungraded Voltorb from XY sells for about $1.47. A PSA 10 is worth more, roughly $7.35 by our estimate, and a PSA 9 around $3.38.
It is a Common, and it shows up about once every 9 XY packs.
Atsuko Nishida drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open XY booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.