Like previous major releases, especially those that set a new generation, Pokémon X and Y went through multiple development stages, many of which included several elements that were eventually dropped or revised before the games' release. Some of these components can still be found within their internal data.
A pre-release screenshot of Route 3 depicts the route with a different camera angle, a different trainer, and lacking the big tree on the left side near the lake.
A pre-release screenshot of Estival Avenue in Lumiose City shows the Lumi Cab in a different spot.
A pre-release screenshot of the bridge in the courtyard of Parfum Palace depicts the bridge as very long and thin, whereas in the final version it is long and has a thick gold part underneath the bridge.
A pre-release image of Coumarine Gym shows the ledges the players jumps onto ropes as being the same color green as the rest of the floor, but in the final version the ledges are a darker green. In addition, the log that the rope is attached to sticks out further than it does in the final version.
Pre-release footage of X and Y showed a ShinyGogoat. Gogoat's Shiny coloration was drastically altered in the final release.
A pre-release image of Oblivion Wing shows the beam of energy as being pure red in color, compared to the final version which has two burgundy-colored streaks inside the beam with some red.
A pre-release screenshot of the Anistar Gym shows a Gym guide who is a young man with light brown hair, a necktie, and brown shoes. In the final version, however, the Gym guide is an adult man with dark brown hair, suspenders, and dark-colored shoes. In addition, the Gym floor, furniture, and statues sport notably different color schemes than in the final version.
Gardevoir and Fairy Wind
The E3 trailer for Pokémon X and Y showed a wild Gardevoir using Fairy Wind on a Hydreigon. In the final game, neither Gardevoir nor its pre-evolutions could learn this move.
Early image of Route 3
Early image of Estival Avenue in Lumiose City
Early image of the bridge in the courtyard at Parfum Palace
Early image of the Coumarine Gym
Image of Shiny Gogoat's original coloration
Early image of Oblivion Wing
Early image of the Anistar Gym
Image from the E3 trailer showing Gardevoir using Fairy Wind
Eternal Flower Floette
AZ's Floette, the Eternal Flower Floette, exists as an alternate form of Floette in the game's data, but it is not obtainable in-game and has not yet been distributed. In addition to Floette's regular moveset, it learns the otherwise unused Fairy-type move Light of Ruin at level 50. It cannot evolve, and it is in the UndiscoveredEgg Group. The Eternal Flower Floette's base stats are higher than that of a normal Floette, its base stat total being 1 less than that of Florges. It has a base experience yield of 243.
Three unused moves exist in the data of the Generation VI games. No legally obtainable Pokémon can learn them, and no Pokémon were ever distributed knowing the move. Thousand Arrows and Thousand Waves can be learned by Zygarde starting from Generation VII in Pokémon Sun and Moon via Zygarde Cube.
Some Pokémon are programmed to have Hidden Abilities in Generation VI, but cannot legally obtain them. These Abilities may have been distributed in a later generation or are currently still not obtainable.
Please note that this is only 100% accurate to Generation VII games.
For Generation III games, ignore Abilities introduced in Generation IV or later and Hidden Abilities.
For Generation IV games, ignore Hidden Abilities.
For Generation V games, ignore Abilities introduced in Generation VI or later.
For Generation VI games, ignore Abilities introduced in Generation VII.
Every Pokémon in the game are programmed to have a Shiny variant, but some of them cannot be obtained legally. These Shiny Pokémon may have been distributed in a later generation or are currently still not obtainable.