004 may refer to:
- #004 Charmander, in the National and Kanto Pokédex
- #004 Cyndaquil, in the New Pokédex and the Johto Pokédex
- #004 Torchic, in the Hoenn Pokédex in Generation III and Hoenn Pokédex in Generation VI
- #004 Chimchar, in the Sinnoh Pokédex
- #004 Tepig, in the Unova Pokédex in Black and White and the Unova Pokédex in Black 2 and White 2
- #004 Fennekin, in the Central Kalos Pokédex
- #004 Mienshao, in the Coastal Kalos Pokédex
- #004 Vibrava, in the Mountain Kalos Pokédex
- #004 Litten, in the Alola and Melemele Pokédex in Sun and Moon and the Alola and Melemele Pokédex in Ultra Sun and Ultra Moon
- #004 Yungoos, in the Akala, Ula'ula, and Poni Pokédex in Sun and Moon and the Akala, Ula'ula, and Poni Pokédex in Ultra Sun and Ultra Moon
- #004 Scorbunny, in the Galar Pokédex
- #004 Buneary, in the Isle of Armor Pokédex
- Clefairy, a Pokémon who in Generation I has the index number of 004
- Charmander, a Pokémon who in Generation II and onward has the index number of 004
- The Poké Ball, a type of Poké Ball which in Generation I and from Generation III and onward has the index number of 004
- The Great Ball, a type of Poké Ball which in Generation II has the index number of 004
- The index number for the move Comet Punch
- Main series:
- Challenge of the Samurai, episode 4 of the original series
- You Never Can Taillow, episode 4 of Pokémon the Series: Ruby and Sapphire
- Dawn of a New Era!!, episode 4 of Pokémon the Series: Diamond and Pearl
- The Battle Club and Tepig's Choice!, episode 4 of Pokémon the Series: Black & White
- A Shockingly Cheeky Friendship!, episode 4 of Pokémon the Series: XY
- First Catch in Alola, Ketchum-Style!, episode 4 of Pokémon the Series: Sun & Moon
- Settling the Scorbunny!, episode 4 of Pokémon Journeys: The Series
- Celebi: The Voice of the Forest, the fourth full-length Pokémon movie
- Pikachu's Rescue Adventure, the fourth Pikachu short animation
- Other anime series:
- Route 4, a route in Kanto
- Route 4, a route in Unova
- Route 4, a route in Kalos
- Route 4, a route in Alola
- Route 4, a route in Galar
- The island named Four Island
- The town named Four Island
- TM04, a Technical Machine
- HM04, a Hidden Machine
- TR04, a Technical Record
- ゥ .4, a glitch Pokémon in Pokémon Red and Blue
- 4. ., a glitch Pokémon in Pokémon Yellow
- Rawst Berry, a Berry that debuted in Generation III
- Secret Storage 4, a location in Pokémon Trozei!
- Huge Storage 4, a location in Pokémon Trozei!
- Phobos Mobile No.4: Phobos Sub, a location in Pokémon Trozei!
- SOL Laboratory 4, a location in Pokémon Trozei!
- Wanted: Pikachu!, round 4 in the Red, Green & Blue chapter of Pokémon Adventures
- Win with Teamwork!!, chapter 4 in Pokémon Diamond and Pearl Adventure!
- Mitsumi's Wish, the fourth special chapter in Pokémon Diamond and Pearl Adventure!
- Battle in a Bitter Cold Land!, chapter 4 in Pokémon Mystery Dungeon: Ginji's Rescue Team
- Haunting My Dreams, chapter 4 of The Electric Tale of Pikachu
- The Cowardly God Of Plagues, chapter 4 of Ash & Pikachu
- Kuchiba City, chapter 4 of Pokémon Zensho
- Let's Aim For The Goal!, chapter 4 of Pokémon Gold & Silver: The Golden Boys
- Akane-Colored Eevee, chapter 4 of How I Became a Pokémon Card
- The Spring World Challenge (Part One) "A New Formidable Rival!?", chapter 4 of Aim to Be a Card Master!!
- A Fated Reunion, chapter 4 of Phantom Thief Pokémon 7
- Receive the Moon Stone!!, chapter 4 of Pokémon Pocket Monsters
- There's Someone More Important Than Clefairy?!, chapter 4 of Pokémon Ruby-Sapphire
- Battle Between Student and Master!, chapter 4 of Pokémon Battle Frontier
- Tangela's Secret, chapter 4 of Magical Pokémon Journey
- Evolution is Scary (chamo?), chapter 4 of Pokémon Chamo-Chamo ☆ Pretty ♪
- Crystal Orb of Rainfall, chapter 4 of Pokémon Gotta Catch 'Em All
- Clash! Yū vs. The Wandering Player, chapter 4 of Pocket Monsters Platinum: Aim to Be Battle King!!