This is missing the following tracks from the single releases of the original anime run (not including karaoke versions):
Mezase Pokémon Master
-Can You Count Pokémon? -
Released on Everyone's Elected Pokémon Song Best Collection
-Good Night, My Pikachu -
Released on POKÉMON GENKI SONG BEST
Can You Draw Pokémon?
-Can You Draw Pokémon? -
Released on Everyone's Elected Pokémon Song Best Collection
-Yes, it's Morning!
-Flabby Gas Gas
-Ah, Electrode
-Pokémon's Crayon
Rocket-dan yo Eien ni
-Rocket-dan Forever! -
Released on Pokémon Sound Picture Box - Shiroi Ashita Da! Rocket-dan and Everyone's Elected Pokémon Song Best Collection
-Lucky Lucky -
Released on Pokémon Sound Picture Box - Shiroi Ashita Da! Rocket-dan
Torikaekko Please
-Let's Trade Please -
Released on Everyone's Elected Pokémon Song Best Collection
The Rivals
-Hey! Pikachu
-Pokémon Sandwich
Lapras ni Notte
-Let's All Walk Together!
Meowth's Party
-Meowth's Song 2000
-So They Say, Nya
-Meowth's Monologue
OK!
-TYPE:WILD <English Ver.>
Pokémon Harahara Relay
-
Pokémon Nervous² Relay (ED9)
Boku no Best Friend he
-Boku no Best Friend he Piano Hikigatari Ver. (TV Size)
-Boku no Best Friend he Orgel Inst. Ver.
Maemuki Rocket-dan!
-Look ahead, Rocket Gang!
Ready Go!
-New Oath (Acoustic Version)
And from other compilations (not counting music from movies/specials):
Pokémon Sound Picture Box - Shiroi Ashita Da! Rocket-dan
-The Path to Becoming Pokémon Master!
-The Sea
Everyone's Elected Pokémon Song Best Collection
-Pokémon Pictorial Songbook - Normal Pokémon Part 1 -
From the single W-Get daze Campaign Special CD - Pokemon Singing Encyclopedia Vol.1 including other exclusive tracks
-Can You Count Pokémon Baby?
Pokémon Song ♪ Best Collection 2
-Can your Pokémon say neo? -
From the single Can your Pokémon say neo? including other exclusive tracks
-We Pichu Pichu Brothers!