Pokémon Go players will be able to considerably expand their pokédexes this week, as Niantic has confirmed the arrival of the fourth generation of pokémon. This generation first appeared in the Nintendo DS games Pokémon Diamond, Pearl, and Platinum, and hail from the Hokkaido-influenced Sinnoh region.

As with the third generation, Niantic will be rolling out the new pokémon in waves rather than all at once. The company says it’ll also be announcing new features and expansion to pokémon storage soon. Meanwhile, a handful of generation 3 pokémon — and even one from generation 2 — are yet to be added to the game, mostly because of unique characteristics that Niantic has to figure out how to integrate.

While the world-dominating hype from its launch has predictably subsided, Pokémon Go remains a phenomenally successful mobile game by any other metric, and continues to add features to attract new players and extract more money from the existing base. Recently the game finally enabled trading, while just this week the Android version got support for more advanced AR through Google’s ARCore SDK. Next month Pokémon: Let’s Go will be released for the Nintendo Switch, featuring heavy integration with Pokémon Go.