- Awesome Music:
- The music that plays during the opening credits.
- "Aaron 1", the song that plays during the montage of the war in the film's prologue. It has since returned for intense action sequences in the series, such as the Nando VS. Zoey battle of the Sinnoh Grand Festival.
- Unbeatable. "You may beat some but you can't beat me" indeed.
- Ensemble Dark Horse: While already darkhorses in their own right, the Regi Trio have garnered some love in their movie debut, as intimidating and absolutely unstoppable juggernauts with some of the most wonderful yet terrifying vocalizations to date.
- Harsher in Hindsight: In Ash's Disney Death scene, where he hurriedly says goodbye to Pikachu and his Pokémon; this film ended up being the final entry in the Pokémon series where Veronica Taylor voiced Ash, and so the scene can be seen as the goodbye to her iteration of him as well.
- Hilarious in Hindsight:
- Brock's first meeting with the wild Bonsly can be seen as even funnier, when, later in Battle Frontier, he would catch a Bonsly of his own.
- Brock's flirting with Kidd is interrupted by this Bonsly. Brock's own Bonsly occasionally takes over the Running Gag of preventing him from hitting on girls.
- The sounds the Regis make sounds a lot like dubstep.
- The city where Kidd's partner Banks is looks an awful lot like Castelia City from above.
- The Mew in this movie has no connection to the Mew of Pokémon: The First Movie. Later, the same happened with Mewtwo's clone, and had a much bigger impact on the fanbase.
- Aaron's interaction with Mew in the Japanese version. Kōichi Yamadera voices Aaron, but he also voiced Mew in the first movie.
- May's dress for the festival, specifically her bow, certainly looks like the one her game counterpart wears in Omega Ruby and Alpha Sapphire, doesn't it?
- While rather dark, it's actually pretty funny that Aaron sacrifices himself to end a war without bloodshed...only for Pokémon Conquest, a game about winning them, to come out a few years later.
- Lucario is voiced by Sean Schemmel, best known as the English voice of Son Goku. Years earlier, Goku's Japanese VA voiced another starring mon in Pokémon's rival franchise.
- Ho Yay: Aaron and Lucario have astronomical amounts of this.
- Just Here for Godzilla: Some people watch the movie for the titular Lucario and his storyline, leading to some disappointment after the darker, more serious opening gives way to the wacky antics of Ash, his friends, all the "cute" Pokémon, and the Rocket trio. This is interesting, as in most cases of this trope the audience ignores the story in favor of something else. Here, they're coming for Lucario's story and ignore everything else.
- Most Wonderful Sound: Out of universe, every time one of the Legendary Golems "speak."
- Surprisingly Improved Sequel: This, the Mewtwo movie (mostly in Japanese), the Lugia movie, the Entei movie, and the Kyurem movie are often considered the high points of the movie series.
- They Wasted a Perfectly Good Character: Kidd being an agent for a secret organization is never brought up again.
- They Wasted a Perfectly Good Plot: The fact that Ash possesses the same power as Aaron and Lucario is never really touched upon in this movie or the series.
- Tough Act to Follow: This movie is praised as one of the best in the series and a successful promotion of an upcoming Pokémon, with Lucario becoming one of the most popular Pokémon for its role in it and great usability in-game. Zoroark and its movie were an attempt to emulate that, but being more gimmicky than useful and harder to acquirenote in-game stopped it from achieving similar success. When they tried again with Mega Mewtwo Y, its movie proved so controversial that it sunk its reputation regardless of its in-game performance until it reappeared in Super Smash Bros. for Nintendo 3DS and Wii U as a form for a more popular version of Mewtwo.
- Wangst: Lucario falls into this for some but through no fault of his own - because the movie shows right from the start that the situation with Aaron was a misunderstanding and that Lucario's belief that he betrayed him is wrong, it's more difficult to feel for him the way you might have without that knowledge.
YMMV / Pokémon: Lucario and the Mystery of Mew