times shredder and krang gain a victory
 

in almost every episode the turtle won but in two instances shredder gain a victory in the eye of zaratoh mini-series the turtles stopped his plans but he manged to ecaspe with the fragments so in a way he still won

in part one of the season three finale the turtles were beaten as they did not realize behop and rocksteady were stealing energy while they chased after shredder to save apirl from the safe.

that all i got but can you name any other instances the villians gain a sort of victory?

technically every time Shredder escaped was a victory of sorts since the turtles could not get rid of Shredder, he kept escaping and able to plan something else, they were only able to thwart his plans temporarily.

The most obvious is "Get Shredder"; Shredder escaped but not before destroying the Channel 6 building and suddenly making the public turn anti-Turtles after viewing them as ture heroes for seasons 4-7; even April's affection with the Turtles took a bit of a hit that season.

When the Technodrome got sucked into Dimension X at the end of Season 1, that was kind of a victory for Krang since be became the master, maybe not for Shredder, but definitely for Krang.

In Bye Bye Fly, Shredder ended up with the ray with all the animals on it and he was able to return himself to normal. Bebop and Rocksteady took it away from the turtles.