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>The player meets Kyuri early on and eventually will acquire the Mega Ring from him along with of course the Key Stone.
>Some Mega Stones are found around the various maps in certain places. They can only be found around the afternoon, mimicking how the player obtains the other Mega Stones in X and Y.
>Other Mega Stones have to be crafted. The player will come across Mega fragments around the maps and mixing it with the right materials will create a Mega stone.
>Once the player connects all 5 inifinity fountains to Lumiose, a celebratory Project begins. This project is the construction of the Prism Tower.
>Sigvald is the secret villain of the game.
>A ton of Ininity Energy is necessary to awaken the A Legendary, Aalphysis. (Pronounced Ay-alf-i-sis)
>The End-Game has the player collecting the final remaining Zygarde Cells in order to obtain 100% Zygarde and mega evolve it to defeat the now awakened Aalphysis.
>During the game, it will be reported that many strange ring shaped objects are appearing around Anthos. These are actually Hoopa Rings.
>The Rings function as a replacement for the Space-Time Distortions from Legends Arceus. It's through these rings that you obtain the Kanto, Hoenn, and Kalos Starters, the Kalos Fossils, Aerodactyl, Kleavor, and more.
>In the Post-Game, several "big portals" will be spotted around Anthos and the player will be tasked with investigating them. They're different from the other Hoopa Rings as they're stationary and found in isolated places around the various maps (very similar to the ORAS Hoopa Rings). This is how you get access to Mewtwo, Rayquaza, Latios, and Latias.
>The Kalos Mythicals and Zeraora are obtainable via having save data on your Switch of existing Pokemon games (Scarlet/Violet for Diancie, Legends: Arceus for Hoopa, Sword/Shield for Volacanion, Brilliant Diamond/Shining Pearl for Zeraora). Each legendary will have a small side quest where you encounter and catch each of them.