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troperville

Tell me...what is more awesome than defeating Primal Dialga as TWO unevolved Basic Pok�mon?
One of the special episodes available in Explorers of Sky, allows you to play as Grovyle. And in the end, you team up with a reformed Dusknoir and Celebi in order to fight Primal Dialga, with epic music playing in the background.
Another special episode, 'Bidoof's Wish', has the moment when Bidoof is alone, beaten up by Snover and his rogues Bagon and Gligar, and about to be robbed, when suddenly the entire Guild appears and thoroughly curb-stomps the robbers in an epic battle for daring to hurt him.
There was Chatot's Heroic Sacrifice in Brine Cave. It was a Rescued from the Scrappy Heap moment for some.
The Atoner Drowzee sending the heroes into Azurill's nightmare was cool. What's even cooler? Saving them from The Big Bad Darkrai himself. Ridiculously awesome when you realize that his moment of suddenly showing up saved the heroes and scared Darkrai away.
- On top of that, he (along with a few others) were perfectly willing to go with you to Dark Crater to defeat Darkrai. It wasn't to be, but the fact remains that many people were ready to help out. Also a Heartwarming Moment.
The special episode "Today's 'Oh My Gosh'" is rather underrated, for the moment when Sunflora apprehends the "invincible" Haunter:
Sunflora: I have...I have proof that you're not invincible!
Haunter: What?!
Sunflora: There's no such thing as an invincible Pokemon! It was nothing but a ruse, right from the beginning! It wasn't invincibility or anything else! Was it, guys?!
Haunter: G-guys...What do you mean?! You found this out?!
Sunflora: Yes. I figured out there isn't just one of you. Come on out! The rest of you! (uses Razor Leaf to bring out the other two Haunter)
- Loudred then helps her beat the trio and arrest them as deserved.
The Hero breaking free out of Darkrai's nightmare by attacking him, realizing their partner would NEVER give up no matter what.
The first time you use a strong hit-all move on a Monster House. Linked Charge+Discharge is recommended.
Wigglytuff showing Team Skull exactly why he has his reputation.
Wigglytuff being the only one to figure out Ditto's ruse in "Here Comes Team Charm".
Palkia intervening when Darkrai tries to escape, resulting in Darkrai getting amnesia.
Grovyle's Heroic Sacrifice after the battle against Dusknoir.
While ineffectual, the Sableye unhesitatingly attacking Dialga when Dusknoir is threatened in "In the Future of Darkness".