Actually I'd say Team Rocket steals (get it?) the spot light in the awesome department. They jerry-rigged a high speed airboat and help Ash get away from the legendary birds through a Heroic Sacrifice! Go figure.
Let's put it this way: when all hope for Ash is seemingly lost, since he's stranded...you will cheer when they show up.
Also, Misty saving Ash from drowning and Melody playing the song that helps save the day.
A minor one, but the huge converging energy beam, Aeroblast, that Lugia fires off toward the end. The first shot damn near bisects Lawrence's massive airship, and the second shot knocks the Legendary Bird Trio for a loop even though it doesn't directly hit any of them; just passing near them for an instant is enough.
Ash gets a few in the movie too. The way to the last island is blocked by fighting birds of doom, icebergs, and a snowstorm? He builds a DOGSLED and has his team pull him over!
Zapdos and Moltres attack Ash on his makeshift sledge. Pikachu and Charizard counter with their own Thunderbolt and Flamethrower, respectively. Pikachu and Charizard WIN!
Also, Charizard nonchalantly dodges as Articuno tries to divebomb him.