The value
- V / VMAX; regulation mark D
Where it comes from
The line in the source
it introduces the new mechanics "Pokémon-V" (that replaces the "Pokémon-GX") and "Pokémon-VMAX"[67] cards
In English
Sword & Shield (EN 2020-02-07, 202/216); same paragraph: first Standard set with the D regulation mark.