It appears Rumble Rush will include live updates, with the game's official Play Store description stating, "The islands and seas explored during your adventures change every two weeks". A close alpha launched with that announcement, but after that, The Pokemon Company went radio silent on the game. It was previously announced in 2017 under a different name-Pokeland-before disappearing into the abyss. One of Nintendo's more popular mobile games, Dragalia Lost, is a gacha game, so it wouldn't be surprising to see that summoning mechanic make its way to other Nintendo games.
Why are they toys instead of actual Pokemon? Named Pokemon Rumble Rush, the free-to-play title is available now in Australia and is "coming soon" to the rest of the world. In it, you control a Pokemon as they battle through stages, picking upgrade materials along the way - similar to the Wii's Pokemon Rumble. It's coming to iOS, and Android.