|Omega Alpha Adventure 0|
Omega Alpha Adventure 0 (Japanese: EPISODE 0 Episode 0) is the debut round of the Omega Ruby & Alpha Sapphire chapter of the Pokémon Adventures manga. This chapter was originally released as a prologue to the then-upcoming Omega Ruby & Alpha Sapphire chapter and was included in Volume 4 of the Ruby & Sapphire chapter re-release. It was later collected into the first volume of the Omega Ruby & Alpha Sapphire chapter.
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- Steven studies strange murals found in Granite Cave alongside Ultima.
- Fearing another disaster will strike Hoenn, Steven decides to have Ruby, Sapphire, and Emerald learn Mega Evolution.
- Sapphire is revealed to have obtained a Kirlia named Kirly.
- Ruby's Rara evolves into a Gardevoir while Sapphire's Kirly evolves into a Gallade.
- For a list of all major events in the Pokémon Adventures manga, please see the timeline of events.
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- Kirlia (Rara/Ruru; Ruby's; evolves)
- Gardevoir (Rara/Ruru; Ruby's; newly evolved)
- Swampert (Mumu/Zuzu; Ruby's)
- Blaziken (Chic/Toro; Sapphire's)
- Kirlia (Kirly; Sapphire's; evolves)
- Gallade (Kirly; Sapphire's; newly evolved)
- Gardevoir (Kirly; Sapphire's; fantasy)
- Sceptile (Emerald's)
- Sudowoodo (Emerald's)
- Metagross (Steven's)
- Altaria (Ali; Lisia's)
- Swampert (Mega Swampert; fantasy; silhouette)
- Blaziken (Mega Blaziken; fantasy; silhouette)
- Sceptile (Mega Sceptile; fantasy; silhouette)
- In the VIZ Media mini-volumes of the Omega Ruby & Alpha Sapphire chapter, this round was collected in Volume 1.
- In Sapphire's fantasy of her Kirly and Ruby's Rara as a Gardevoir pair, the pose they make is a reference to Kamen Riders Ichigō and Nigō from the original Kamen Rider series. Her referring to the pair as "a duo of strength and skill" also ties into this.