If you'd like to try it, you'll have to create a Japanese account using this guide. Be warned that the game might not feature an English translation yet.
It was announced earlier this year on iOS and Android and it's actually out now in Japan. Sadly, there's no localization to be found just yet and no iOS version in sight but it could be coming west soon.
This also means that more details are coming from the game's official website. The game uses diamonds as the main premium currency which can then be used to summon new Pokémon.
You can also play online or locally against other players or train against the AI.