In this episode, Misty doesn't seem to care about the Bug-type Pineco. Indeed, it is revealed in a later episode that Misty wasn't even aware that Pineco was a Bug-type.
This episode marks the final appearance of the GS Ball, which is left with Kurt. The storyline is dropped at this point, and besides a flashback in Hour of the Houndour (2000), the GS Ball is never seen again due to a planned arc featuring Celebi being scrapped by the anime producers.
The Celebi arc was subsequently used as part of the fourth movie's plot, although the GS Ball itself wasn't referenced or even took part in the movie's events.
Brock uses his Fast Ball to catch a Pineco.
Ash, Misty, and Brock each receive a Fast Ball from Kurt.
Ash leaves the GS Ball with Kurt.