The original Pokémon TV series contains 276 episodes before Pokémon the Series: Advanced begins.
This total covers Ash’s first major television storyline, including the Kanto, Orange Islands, and Johto adventures. The original series starts with Ash leaving Pallet Town and ends after the Johto League and the closing events of the Johto story arc.
The 276-episode count is separate from the later Advanced Generation, which begins a new numbered series and moves Ash to the Hoenn region. It is also separate from unaired or removed episodes, which can create confusion when viewers compare episode lists from different countries.
International episode availability has not always been identical because some installments were delayed, edited, or omitted in particular markets. In standard series classifications, however, the original Pokémon anime is counted as 276 episodes, making it one of the longest opening chapters in the franchise.