Every now and then, special episodes will air that aren't a part of the TV series.  These episodes often vary in length, feature aspects of the franchise not covered by the regular TV series, and may or may not be a part of the regular TV series' main canon.  Some have never been dubbed, while others have premiered in the U.S. before debuting in Japan.  When it comes to the TV specials, there don't seem to be any rules.

All specials below are listed in the order in which they originally aired.

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YD	"A Day in the Life of Yadoking"	--	N/A
ML	"Mewtwo Lives!"	--	"Mewtwo Returns"
PMC	"Pocket Monsters Crystal - Raikou, The Legend of Thunder"	--	"The Legend of Thunder - The Movie"

SPH 007	"Takeshi!  Save Nibi Gym!"	PC 05	"A Family that Battles Together Stays Together"
SPH 008	"Hanada Gym's Revenge Match!"	PC 06	"Cerulean Blues"
SPH 009	"Do Your Best!  Look Ahead Rocket-Dan?"	PC 07	"We're No Angels!"
SPH 012	"The Orchid Residence Decisive Battle!"	PC 08	"Showdown at the Oak Corral!"
SPH 018	"Kasumi!  Get the Blue Badge!"	PC 09	"The Blue Badge of Courage!"
SPH 019	We Pichu Brothers "The Millenium Town Encounter" and "A Part-Time Job is Difficult Nyasu!?"	PC 19	"Of Meowth and Pokémon"
SPH 023	"The Pokémon Investigation Network!  Search for Orchid-Hakase!!"	PC 10	"Oaknapped!"
SPH 033	We Pichu Brothers "Calling on Detective Nyasu!" and "Niece Ruriri's Big Trouble?"	PC 21	"Big Meowth, Little Dreams"
SPH 040	"Kasumi's Earnest Struggle! She's Risking Her Life!?"	PC 11	"A Date with Delcatty"
SPH 044	"The Rocket-Dan! Love and the Origin of Youth"	PC 13	"Training Daze"
SPH 045	"Another Legend of Celebi"	PC 12	"Celebi & Joy!"
SPH 046	"Masara Town, The Setting off of a Pokémon Trainer"	PC 14	"Journey to the Starting Line!"
SPH 065	"The Pokémon Researcher Shigeru and the Revival of Ptera"	PC 15	"Put the Air Back in Aerodactyl"
SPH 087	"Kasumi and Lovecus! Love Battle"	PC 16	"Luvdisc is a Many Splendored Thing!"
SPH 088	"Nanako and Lizardon! The Intensive Fire Training!"	PC 17	"Those Darn Electabuzz!"
SPH 089	"The Heavenly Legend, Hiroshi and Fire!"	PC 18	"The Search for the Legend"
TEN	"The Terrifying Mirage Pokémon"	--	"The Mastermind of Mirage Pokémon"
PMD	"Pokémon Mysterious Dungeon - Dispatch the Ganbarus Rescue Team!"	--	"Pokémon Mystery Dungeon - Team Go-Getters out the Gate!"

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PS 152	"Pokémon Mystery Dungeon - Time Expedition Team & Darkness Expedition Team"	--	"Pokémon Mystery Dungeon Explorers of Time & Darkness"
PS 234	"Pokémon Mysterious Dungeon Sky Rescue Team - The Final Adventure Concerning Time and Darkness"	--	"Pokémon Mystery Dungeon Explorers of Sky - Beyond Time & Darkness"
PS 280	"Pokémon Ranger and the Tracks of Light" (Part One)"	--	N/A
PS 281	"Pokémon Ranger and the Tracks of Light" (Part Two)"	--	N/A

TO 01	Pocket Monsters The Origin Report 1 - Red	--	Pokémon The Origin File 1 - Red
TO 02	Pocket Monsters The Origin Report 2 - Karakara	--	Pokémon The Origin File 2 - Cubone
TO 03	Pocket Monsters The Origin Report 3 - Sakaki	--	Pokémon The Origin File 3 - Giovanni
TO 04	Pocket Monsters The Origin Report 4 - Lizardon	--	Pokémon The Origin File 4 - Charizard

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01	"Satoshi and Gou! Let's Go to the Sinnoh Fes!!"	--	"Pokémon: The Arceus Chronicles"
02	"Headran's Explosive Start!!"
03	"The Red-Hot Battle of Mt. Tengan!!"
04	"The Miraculous Light! The Sinnoh Legend!"