What where all of the Pokemon episodes Richie was in?

Richie was a main character in the Pokémon: The Orange Islands saga, which spanned from episodes 193 to 219 of the Pokémon anime.

He was also featured in the following episodes:

* Episode 182: "The Power of One" (he appeared briefly, challenging Ash to a battle after the Indigo League)

* Episode 220: "To Master the Unknown" (He briefly appeared at the end of the Orange Islands saga, revealing he had joined the Gym Leaders' conference on Shamouti Island)

Richie's appearances were mostly limited to the Orange Islands saga, but he played a significant role in that particular storyline. He served as Ash's rival and was a strong trainer in his own right.