From Bulbapedia, the community-driven Pokémon encyclopedia.

English title	Season	Debut episode	Final episode	Screenshot
Pokémon Theme	Pokémon: Indigo League	EP001	EP083
Pokémon World	Pokémon: The Adventures in the Orange Islands	EP084	EP116
Pokémon Johto	Pokémon: The Johto Journeys	EP117	EP157
Born to Be a Winner	Pokémon: Johto League Champions	EP158	EP209
Believe in Me	Pokémon: Master Quest	EP210	EP274
I Wanna Be a Hero	Pokémon Advanced	AG001	AG040
This Dream	Pokémon: Advanced Challenge	AG041	AG092
Unbeatable	Pokémon: Advanced Battle	AG093	AG145
Battle Frontier	Pokémon: Battle Frontier	AG146	AG191
Diamond and Pearl	Pokémon: Diamond & Pearl	DP001	DP052
We Will Be Heroes	Pokémon Diamond & Pearl: Battle Dimension	DP053

Trivia

• Each of these themes was also used as the English ending theme in episodes where they were used, except in episodes where Battle Frontier was the opening, where Go Pokémon Go served as the ending theme instead.
• All opening themes were sung by males until We Will Be Heroes.

Pokémon Chronicles

English title	Debut episode	Final episode	Screenshot
Pokérap GS*	The Legend of Thunder! (Part 1)	The Legend of Thunder! (Part 1)
Pokémon Chronicles theme	The Legend of Thunder! (Part 2)	Christmas Night/Kanga Games

Other

English title	Episode	Screenshot
Side by Side	Pichu Bros. in Party Panic
Go Pokémon Go	The Mastermind of Mirage Pokémon*