More information has been revealed for S2a Explosive Walker.
This set will contain 70 cards + Secret Rare cards. It will release on April 24, 2020.
A sell sheet contains more information about this set.
This set contain Centiskorch VMAX. This VMAX card will have a high firepower that could damage VMAX cards very hard.
Explosive Walker will boost Fire type Pokémon. It will contain a Special Fire Energy that Centiskorch VMAX will take advantage of, making this a very powerful Fire deck.
This set also includes a very powerful trainer card that would support evolution (VMAX specifically) cards.