A series of the Pokémon anime is a collection of episodes that corresponds roughly to a specific generation of games. The "series" distinction is made only in Japan, as dubbed episodes air in seasons (for example, Pokémon: Advanced is season 6, not AG season 1).
On Bulbapedia, the episodes in each series are divided from other series by their episode code. Episodes in the original series are denoted by EP, those in the Advanced Generation series by AG, those in the Diamond & Pearl series by DP, and those in the Best Wishes series by BW.
List of series
|Series||Generation||Debut Episode||Final Episode|
|Original series||Generation I|| EP001
Pokémon - I Choose You!
The Rivalry Revival
|Generation II|| EP117
Don't Touch That 'dile
|Advanced Generation series||Generation III|| AG001
Get the Show on the Road
Home is Where the Start Is!
|Diamond & Pearl series||Generation IV|| DP001
Following A Maiden's Voyage!
Memories are Made of Bliss!
|Best Wishes series||Generation V|| BW001
In The Shadow of Zekrom!