Meloetta's Moonlight Serenade is a short film by Pikachu the movie accompanied with the film Kyurem Vs The Sword of Justice.
Pokemon
The sort film features a variety of Pokemon from other Pokemon, short films and major chatacters from the series
Ash's Tepig
Jigglypuff (The Song of Jigglypuff)
Diglett (The Power of One)
Dugtrio (The Power of One)
Pichu (Pikachu's Island Adventure)
Pichu Brothers (Pikachu and Pichu)
Spiky Eared Pichu (Arceus and the Jewel of Life)
Plusle (Destiny Deoxys)
Minun (Destiny Deoxys)
Kecleon (Pikachu's Pikaboo)
Clamperl (Clamperl of Wisdom)
Riolu (Pokemon Ranger and the Kidnapped Riolu)
Meloetta (An Epic Defence Force)
Trivia
All starters to Generation V appear in Meloetta's Moonlight Serenade (All being owned by a main character)
Meowth returns to a more Comedic roll in this Movie with a crush on Meloetta
The Film takes place in an unknown part of the Pokemon World called "Pokemon Forest" with "Lunatone Rock"
In Japan, it was tied with Kyurem vs the Sword of Justice but it was released internationally on Pokemon TV on 15th February 2012