Dexio and Sina are waiting for you at the entrance to Poni Meadow. Dexio brings up Mega Evolution and battles you to show it off, using his Mega Ring to Mega Evolve his Alakazam.
After the battle, Dexio and Sina explain Key Stones and Mega Stones, and give you a Key Stone of your own to attach to the opposite end of your Z-Power Ring, along with Alakazam's Mega Stone, Alakazite.
Looker and Anabel are also here, on their way to the Battle Tree so Anabel can train, with Looker serving as her bodyguard. He gives you a Red Card and takes his leave now that you have dealt with the Ultra Beasts that were loose in Poni Grove.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A gap in the tree roots at the meadow's north end opens into Resolution Cave. You will need Mudsdale Gallop and Tauros Charge to navigate the cave. At the intersection, going South and then East leads to another cave section. Here, a wild Zygarde waits on the raised platform in the center of the cave's interior.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
At the end of the road, you finally reach the Battle Tree. Two familiar faces are waiting the first time you walk in: Red and Blue, Champions of a distant region who have come to Alola to run the facility, and who offer you the choice of which of them to battle right here and now. Blue heals your team before the match begins.
Once you've met them, Red and Blue settle into their roles as the Battle Tree's resident Battle Legends, and the facility itself opens up into three formats: Single, Double, and Multi Battle, each with a Normal Course of twenty battles and a Super Course that continues indefinitely once you clear it. Winning streaks earn Battle Points, and every twentieth win in a Normal Course (fiftieth in a Super Course) puts you across from whichever Battle Legend matches your chosen format, Red for Single Battles and Blue for Double Battles, with both of them teaming up for Multi Battles.
For Multi Battles, you can team up with Pokémon Breeder Rada by default, or scout other Trainers you've beaten to recruit them as partners instead. Lillie also is available as a Multi Battle partner: after finishing Episode RR, you can find her back at Professor Kukui's lab on Route 1, and speaking to her there adds her to your roster of partners.
Beyond the Battle Legends Red and Blue, Super Battles bring in a rotating cast of special Trainers every ten wins, drawn from familiar faces across the regions: Anabel, Colress, Cynthia, DexioUM, Grimsley, GuzmaUM, KiaweUS, Kukui, MallowUM, PlumeriaUS, SinaUS, and Wally. Each of these Trainers battles with a team drawn at random from a large preset pool rather than one fixed lineup, so there's no single roster to record for any of them; the same applies to the ordinary Trainers who make up the bulk of every win streak, whose teams come from a shared pool of nearly a thousand Pokémon and moveset combinations rather than from any one battle you could point to.
