(SPOILERS) According to hackers, data miners, and trusted Pokémon sources, the public Sun and Moon demo contains files revealing the sprites of many unannounced Pokémon, including the final evolutions of the starters: You’ll note that these images look exactly like the ones that were leaked earlier in the year, meaning that hardcore fans have known about the new monsters for months now.
Actually, a lot of information relating to the new games leaked ahead of time, including the information that Sun and Moon would eschew gyms.
According to data miners, most of the sprites within the demo are “shinies,” that is, versions of Pokémon in rare colors.
According to the leaks, there are eight UB in total, at least within the demo: More Alolan forms have also been discovered, though so far it’s been entirely creatures from the first generation.
In the meantime, not only is the Sun and Moon demo getting data mined, some people are already figuring out how to hack the game.