-Anytime Takatora Kureshima was onscreen wrecking everybody.
-All of Tsukasa Kadoya's pre-fight speeches. He's gonna lay out eactly why the people he's teaming up with and/or he himself is better than you, then he's gonna kick your ass. My personal favourite is the one he gives to the Showa Riders alonside Takumi and Kouta in Kamen Rider Taisen.
-Group Henshins. All of them, even the ones from series I don't particularly care for. God help me, I just love a good group Henshin. Special mention goes to team Decade's henshin in Movie War 2010, Wizard and all three Fourze Riders in MW Ultimatum, the Double/OOO/Fourze one from MW Megamax and the big one in the Gaim soccer movie.

Do I even need to say it?

http://media.tumblr.com/443085ad5afd...pvgfo2_500.png

wait, what's that I hear? -cyclone effect acoustic rises in the distance-

Let's see...
The Melon Bowl
Kaito Vs Kouta at the end of Gaim
Wizard's fight in the Movie Wars Battle, in Haruto's underworld
The Climax Form Debut in Den-O
Final Form Ride: Hibiki

All the friendship that Gentarou made friends.

Final Form Ride Hibiki is the single best moment in Decade.

The final finishing move in Den-O is pretty baller.

For what it's worth, my favorite moment in Wizard is when Haruto punches Gremlin, grabs Koyomi's hand, and pulls out the Philosipher's Stone.

The scene in that OOO movie where Eiji clones himself and then uses every combo at once? So badass.

I'm probably forgetting countless others...

There are plenty but right now this is the first thing that I can think of
https://www.youtube.com/watch?v=uvjqynGZwP4

This.

Many Riders can, and do, defeat the big bad. Usually in some show, awesome way.

But Gentaro not only beat the guy senseless, he did so while his friends broke Sagittarius' spirit, showed him how wrong and corrupt and lonely his path had become. And the, AND THEN! He befriended the guy. The man who had caused the death of one of his best friends and said friend's father, the man who would've destroyed all of Japan, probably the world, for his ambition.

And he accepted the offer.

THAT is why Gentaro will forever be one of my favorite Riders.

Damn the Hopper Brothers have no mercy at all.

im going to have to say, the first time Kota henshins. or the revelation that Micchi is now what takatora Was.