No, from what I understand, after Mondo was rebuilt after being destroyed by the Rangers the first time, they both fled the galaxy and were just never seen again.
Yup, and even if they were caught in the wave, they would have probably been turned good. Just like Rita and Zedd, they did legitimately love each other. That seemed to be enough to not be killed by it.
On a related note, I would assume most of the faceless minions would've been immune to the wave, too. Many of them weren't actually evil. They were just mindless drones.
I say we can put her on the milk carton of evil, I think the producers just said ''screw it'' and got rid of her. She's in a block of concrete at the bottom of the Atlantic along with Jimmy Hoffa.
That's easier to assume because if they were still around, chances are the remnants of the machine empire might've hailed them as the new leaders. Or they would have been around in Forever Red. My guess is they were destroyed by the Z-Wave.
Scorpina is really in the air. Could have been destroyed, may have turned human, or could have survived somehow since she wasnt even part of this alliance of evil.