About
“Sinnoh Confirmed” Is a catchphrase associated with fan speculations and hoaxes about a possible remake of Nintendo’s Pokémon Generation IV video games Diamond Version and Pearl Version, both of which are set in the Sinnoh region. It is used similarly to Half-Life 3 Confirmed.
Origin
Pokémon Diamond and Pokémon Pearl were released in September 2006 in Japan and throughout 2007 for the rest of the world, marking the launch of the fourth generation of Pokémon video games. The belief that there will be remakes of these games stems from the fact that there had been remakes of the Pokemon generations prior to Diamond and Pearl. Because the remakes of Generation I were released during the Generation III, Generation II during the Generation IV, and Generation III during the Generation V games, many fans believe that Generation IV would be revived during Generation VI. This lead to certain fans looking for details in the Generation VI titles that would hint at a remake of the Generation IV games. Amidst intense speculations on Pokémon fan forums, “Sinnoh confirmed” became a tongue-in-cheek way of mocking these believers.

Spread
After the launch of Pokémon Omega Ruby and Pokémon Alpha Sapphire, the meme rose to some popularity, seeing that rumors had been confirmed of the Hoenn region getting a remake, many fans began to look for hope that there may be a remake of the Generation IV games. It has spread on several social media platforms and websites, such as Reddit [1], Tumblr [2], and Twitter [3].
Notable Examples







Search Interest
External References
[1]Reddit – Sinnoh confirmed!!
[2]Tumblr – Sinnoh Confirmed Tag
[3]Twitter – Sinnoh Confirmed Hashtag