I have multiple favorite team ups:

Lightspeed with Lost Galaxy-My favorite part was when the Omega Megazord got the Lights of Orion

Forever Red-10 awesome Red Rangers fighting together

Wild Force with Time Force-Best part was when Time Fore Red, Quantum Ranger, and Wild Force Red used their battlelizers

Dino Thunder with Ninja Storm-I liked the idea of the Ninja rangers turned evil but it took 11 rangers to beat Lothor again

15th Anniversary- I was glad the Johnny Yong Bosch returned to be the Black Ranger again with a new morphing sequence but I didn't like how it was only one power ranger from the Saban era while the rest were Disney.

...My jaw just literally dropped; I am just listening to Power Rangers right now.

 

1. Wild Force/Time Force.

2. Forever Red.

3. Dino Thunder/Ninja Storm.

4. MegaForce War at the end of that season.

Time Force.

I have the Time Force blanket it has the blue ranger and he kind of blends in with the cover lol.

Forever Red, no doubt about it.  I was so tremendously excited when I first saw it.

Shinkenger and Decade tag team up ftw ~ it was awesome to see Shinken Red/Samurai Red Ranger use Masked Rider Decade's signature "Final Attack Ride" King Blade form slash attack while Masked Rider Decade himself uses Shinken Red's signature "Rekka Daizantou" slash ~

 

S.P.D.

America:Forever Red 

Japan:.....Too....many....to count

The massive Megaforce crossover whenever it will air

Forever Red, most definitely. It's not just good or great. It's freakin' awesome, except for the Serpentera/Wild Force Rider thing. That was beyond lame. People usually hate Trakeena's Revenge because of the little girl, and I will admit that episode unnecessarily contrived reasons to keep her onscreen, but it's still good. The only ones that suck are Time for Lightspeed for its lame anticlimax and Clash of the Red Rangers for not even technically being a team-up since they couldn't bring anyone from RPM back. They might as well not even bothered to make the episode.

 

I'm not gonna jump the gun and say Legendary Battle because they could end up screwing this up. People don't seem to realize Legendary Battle has something working against it that Forever Red and Once a Ranger doesn't, and that's the fact that it's also the series finale of Super Megaforce. Team-ups, anniversaries, and series finales are already hard enough to pull off for any show, but to be a satisfying team AND be a sendoff for these characters AND tie up the plot, and for PR to do it all in one 30 min episode is damn near impossible.

 

I still think this could have been done if Judd Lynn, Amit Bhaumik, or Jackie Marchand were writing it, but this is Super Megaforce, one of the poorer written seasons in the franchise next to Megaforce, both Samurai, and Turbo. If a great show like How I Met Your Mother could mess up a series finale (not to say it was bad, just misguided), and while I enjoy Super Megaforce and am (admittedly unrealistically) excited and looking forward to Legendary Battle, I don't really have much reason to think it won't blow up in our faces, and if it does, I will rage.