Assuming you are talking about the Nintendo DS game, Pokémon Diamond will cost you about $34.99 USD. This price may change depending on where you purchase the game and if there are any sales or discounts going on.
The Pokémon series is a popular franchise that started back in 1996 with the release of Pokémon Red and Blue for the Game Boy system. Since then, there have been many sequels and spin-offs released across various Nintendo platforms, including the Nintendo Switch.
Pokémon Diamond is one of the mainline Pokémon games that was released for the Nintendo DS back in 2007. The game takes place in the Sinnoh region, which is based off of Japan’s Hokkaido prefecture. In this adventure, you take on the role of a young trainer who sets out to catch and train as many Pokémon as possible while also trying to stop Team Galactic from their nefarious plans.
If you’re a fan of previous Pokémon games or are just looking for a fun RPG to play, then I would highly recommend giving Pokémon Diamond a try!