Re: Lord Zedd and Rita vs. The Machine Empire(Read Scenarios)
1. Rita Repulsa's Monsters(S1) vs. The Machine Empire's Monsters
I'm going to give it to Rita's monsters, since they seem to have greater feats and more impressive powers. Besides, none of Mondo's monsters established any method that could stop powers like Knasty Knight's, Pudgy Pig's, or Terror Toads.
2. Lord Zedd's Monsters(S2) vs. The Machine Empire's Monsters
Lord Zedd wins. If you look at the big picture, you have monsters like Pirantishead who controls machines(obviously a huge threat), Octophantom who is basically unstoppable until he sees his reflection, Magnetbrain who control's the earth's polarity, Trumpet Top who can make anything believe their illusions to be real, Beamcaster who can mind control anything he wants, and ect. In that case, Zedd had some of the most powerful monsters in PR history.
3. Rita and Lord Zedd's Monsters(S3) vs. The Machine Empire's Monsters
I'll say Rita and Zedd's monsters win. Most of their creatures in the third season transformed the Rangers into numerous objects and creatures, or just swallowed them, and it took scientific outside help to win. Mondo's monsters don't have that kind of intellect or time.
4. Putties vs. Cogs
The Cogs win. They have shown to do well against forces that tore the original Putties apart. Plus, the laser eyes give them an even greater advantage.
5. Z-Putties vs. Cogs
Tough call. The Z-Putties have the advantage of better speed and intellect in battle compared to the Cogs, but the Cogs have the advantages of eye lasers and easy targets(the Zs on the Z-Putties' chests). I'll say either Cogs or tie.
6. Tengas vs. Cogs
It was shown already in Zeo. It's a tie.
7. Goldar(pre-Jobber) vs. Prince Gasket
Goldar owns this fight. Gasket never showed more than a couple of tricks, while Goldar was a team breaker.
8. Lord Zedd vs. King Mondo in a one on one fight to the finish with all energy powers intact
Lord Zedd wins. Not only has he schooled Tommy(who Mondo lost to), but his feats outside of battle as well have been stunning. I mean, imagine his strength if he can throw a bomb from the moon to the earth across gravity-less space in seconds! Plus, he overpowered Rita without a second though, who created massive earthquakes, her own island, her own dimension(which Zedd has made many of(and conquered)), controlled the planet's weather, and so on. He has has some insane feats and standards, while Mondo can only be said as 'impressive'. Zedd was easily above that.
9. Who was a greater enemy to the Power Rangers: Lord Zedd or King Mondo?
Zedd. Mondo was a threat but he could be stopped well handedly, and the Rangers could take a break. Lord Zedd constantly put our heroes to near death over and over again, and put them on the alert 24/7. Sometimes, it was only miracles that stopped Zedd from succeeding.