When in inuyasha does kudo shinichi appear?

Answer 1

Kudo Shinichi appears in: (The episode is in bold when he turns back into Kudo Shinichi, the rest are flashbacks and cameos)

Episode 1- The obvious episode where he shrinks

The Murder of the Diplomat Parts 1 and 2 (episodes 48 and 49)

Memories of First Love Part 2 (Episode 101) *This is a flashback of Shinichi in middle school

Kudo Shinichi's First Case: A Locked Room Murder In The Sky (1 hour special) (Episode 162) *This is a flashback of Shinichi's first case

The Desperate Revival Episodes 190-193

Famous Detectives Gathered! Kudo Shinichi vs. Kaito Kid (2 hour special) *This is a flashback of the first faceoff between Kaito and Shinichi, back before he turned into Conan

Kudo Shinichi's New York Case: The Murder (Episodes 286-288) *Flashback 1 year ago in New York City

Friendship That Couldn't Be Bought With Money (Part 2) (Episode 330) *Cameo

Ran's Suspicions (Episode 400) *Flashback

The Mystery of the Perfectly Halved Crime (Episode 413) Cameo

Ueto Aya and Shinichi: The Promise Made 4 Years Ago (Episode 437) *Flashback four years in the past

The Mystery That I Loved (456) *Cameo

Kudo Shinichi's Childhood Adventure (472-473) *Flashback ten years ago to show a young Shinichi, Ran, Sonoko, Yusaku Kudo, Yukiko, Kogoro, Eri (still hapilly married to Kogoro), Toichi Kuroba (the original Kaito Kid before he was murdered by Snake {see Magic Kaito series for explanation}, and Kaito Kuroba, aka Kaito Kid)

Hattori Heiji vs. Kudo Shinichi: The Grand Deduction Showdown! (1 hour special) (490) Flashback to when Heiji and Shinichi were in middle school)

Murderer, Kudō Shinichi (1 hour special) (521)

Shinichi's True Colors and Ran's Tears (1 hour special)(522)

What She Really Wants To Ask(523)

Answer 2

Ahem. You've gotten two animes confused, I'm afraid. I doubt this is a real question, but I'm gonna answer it anyways. Never, because Shinichi Kudo is from Detective Conan/Case Closed.