Encounter the villainous team holding Professor Cozmo hostage and engage them in a double battle with your rival; after you defeat them, the opposing villainous team appears, the first team steals the Meteorite from Prof. Cozmo, and both teams head to Mt. Chimney. You then escort Prof. Cozmo back to Fallarbor.
Meet Steven on the first bridge; he gives you the Devon Scope so you can defeat an invisible Kecleon nearby (and the one in front of the Fortree Gym) and afterwards gives you the Mega Stone for your starter
Defeat Winona for the Feather Badge, unlocking Fly
A meteoroid is detected heading straight for Hoenn; Zinnia is revealed
Be returned to Littleroot Town
Get Pair of Tickets to the star show in Mossdeep from Norman and be told to invite your rival to come with you; meet Zinnia outside your house
If you afterwards re-enter and exit your house, Prof. Birch will be attacked by a Shroomish on R101, and you will get to choose a Johto starter to save him with
Visit your rival's house and find out Zinnia stole his/her Key Stone and is headed for Petalburg City next
Petalburg City: Magma Admin CourtneyOR/Aqua Admin MattAS tries to get Wally to hand over his Key Stone, and you battle, after which Steven calls you on the PokéNav Plus to ask you to meet him at the Devon Corporation
Devon Corporation in Rustboro City: Mr. Stone asks you to get a Meteorite Shard from Granite Cave
Battle Zinnia in Steven's room in Granite Cave and get the Meteorite Shard
Bring the Meteorite Shard to Steven and Prof. Cozmo in the Mossdeep Space Center and be told you'll also need to get another meteorite shard from Meteor Falls
Meet Steven and Zinnia's grandmoth in Meteor Falls and find out about the Draconid people's history with Rayquaza; Steven heads back to Devon
Battle three villainous grunts in a row outside the Devon Corporation who are attacking the Devon employee, and find out they stole a dimensional shifter and are headed for the Mossdeep Space Center
Mossdeep Space Center: Battle a horde of villainous grunts and have a tag battle with Steven against Courtney/Matt & a grunt; Zinnia then shows up, destroys the dimensional shifter, exposits about an alternate Hoenn without Mega Evolution, steals the villainous admin's Key Stone, and then heads for the villainous hideout near Lilycove
Go through the villainoushideout to the leader's room, where you see Zinnia steal his Key Stone and announce that she will be heading to Sky Pillar to summon Rayqauaza; MaxieOR/ArchieAS then gives you his CameruptiteOR/SharpedoniteAS
Speak to Steven in the Mossdeep Space Center again; he tells you to speak to Wallace in the Cave of Origin about entering Sky Pillar
Speak to Wallace outside the Cave of Origin; he tells you to meet him outside Sky Pillar
Battle Wallace outside Sky Pillar
Ascend Sky Pillar as Zinnia relates the history of the Pillar and Rayquaza to you. When you reach the top, she summons Rayquaza and tries to make it Mega Evolve but soon discovers the only power source that can accomplish this is the Meteorite in your bag, which Rayquaza swallows.
Last chance to save before the end of the Delta Episode!
Capture Rayquaza and be forced to add it to your party (It automatically moves to the front)