Battle Styles is the 5th set in the Sword & Shield expansion of the TCG game. March 19th, 2021 is the official release day - these are guarantee to be fulfilled but not on release day. Pokemon is releasing product in waves - this is for the second wave of product release.
Rapid Strike Battle Styles!
ThePokémon TCG: Sword & Shield — Battle Styles expansion will include Battle Style Pokémon such as Single Strike Urshifu V, Rapid Strike Urshifu V, Single Strike Tyranitar V, and Rapid Strike Empoleon V, among others. Combine previously introduced VMAX mechanics with the new Battle Styles, and you get Single Strike Urshifu VMAX and Rapid Strike Urshifu VMAX in their Gigantamax forms.
Here's what else you can expect from the Sword & Shield—Battle Styles expansion: