what episode does charizard return to ash

Charizard returns to Ash in “The Fires of a Red-Hot Reunion!” in the Unova era, when Ash asks Charizard to rejoin his team and Charizard agrees.

A couple of related episodes are often confused with that return:

• “Charizard Chills” is the episode where Charizard starts obeying Ash more reliably.

• “The Symbol of Life” is another later return, when Charizard helps Ash battle Articuno.

So if you mean the episode where Charizard rejoins Ash, the answer is “The Fires of a Red-Hot Reunion!”