Maybe Huntik (2009-2012)?
According to Wikipedia,
In India, the series' first season aired on Disney XD (India) in 2010.
There's Lok, the blonde guy who discovered his father's amulet. While studying with a friend, it is revealed that his father, who was missing, may be alive. Lok and his friend go on a quest to find him, based on hints in the father's journal (see picture below).
There are creatures known as the Titans, and they're summoned by amulets. Below is a collection of Titans and their amulets.
Throughout the series, the kids fight against the evil Organization, whose goal is to rule over the world (such originality !). The Organization seeks a huge, legendary-like Titan to ensure their doomination. So basically, they're like villainous Pokémon teams, but without the catchy name.