The timeskip, also known as the “two-year gap,” is a major event that occurs in several anime and manga series, and can refer to a period of time where the story jumps forward in time by a significant amount. While the specific episode or chapter of the timeskip can vary depending on the series, some examples of popular anime and manga that feature a timeskip include Naruto, One Piece, and Fairy Tail.

In Naruto, the timeskip occurs between episodes 220 and 221, which marks the end of the original Naruto series and the beginning of the sequel series Naruto: Shippuden. The timeskip in Naruto occurs two and a half years after the end of the original series, and is used to show how the characters have grown and changed since the end of the previous story arc. During the timeskip, Naruto trains with Jiraiya to improve his ninja skills and prepare for a confrontation with the Akatsuki, a group of powerful rogue ninja who are seeking to capture the Nine-Tailed Fox within Naruto.
In One Piece, the timeskip occurs between chapters 597 and 598 of the manga, and between episodes 516 and 517 of the anime. The timeskip in One Piece occurs two years after the end of the “Paramount War” story arc, and is used to show how the Straw Hat Pirates have improved their skills and abilities in order to face new challenges in the New World. During the timeskip, the crew is separated and trains with different mentors in order to develop new techniques and prepare for their next adventure.
In Fairy Tail, the timeskip occurs between chapters 258 and 259 of the manga, and between episodes 123 and 124 of the anime. The timeskip in Fairy Tail occurs seven years after the end of the previous story arc, and is used to show how the characters have grown and changed during that time. During the timeskip, the characters are separated and go their own ways, with some of them training to improve their magic and others pursuing different goals and ambitions.
Overall, the timeskip is a common narrative device in anime and manga that is used to show how the characters have grown and changed over a period of time. While the specific episode or chapter of the timeskip can vary depending on the series, it is often used to signal a new chapter in the story and set the stage for new challenges and adventures for the characters.