TM sprite oversight is an oversight in Pokémon Black and White regarding two TMs: TM67 (Retaliate) and TM94 (Rock Smash). They both use the TM sprites for Dark and Rock type moves respectively, even though they are Normal and Fighting type moves.
Retaliate is a Normal-type move, but its TM sprite is shown as a Dark-type move. This is only present in Japanese versions of Black and White.
TM94 Rock Smash
Rock Smash is a Fighting-type move, but its TM sprite is shown as a Rock-type move. This has not been fixed in newer releases.