If you look in the PKHex met locations, there's 2 for Kanto.

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24KB, 60x95px

>>30230000
checked

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63KB, 300x300px

>>30230000
K-On! (けいおん! Keion!?) is a Japanese four-panel comic strip seinen manga written and illustrated by Kakifly. The manga was serialized in Houbunsha's seinen manga magazine Manga Time Kirara between the May 2007 and October 2010 issues. It was also serialized in Houbunsha's magazine Manga Time Kirara Carat. The manga relaunched from April 2011 to June 2012 with two separate storylines published in Manga Time Kirara and Manga Time Kirara Carat. The manga is licensed in North America by Yen Press.

A 13-episode anime adaptation produced by Kyoto Animation aired in Japan between April and June 2009. An additional original video animation (OVA) episode was released in January 2010. A 26-episode second season, titled K-On!! (with two exclamation marks), aired in Japan between April and September 2010, with an OVA episode released in March 2011. An animated film based on the series was released in Japan on December 3, 2011. Bandai Entertainment had licensed the first season until their closure in 2012. Sentai Filmwork

>>30230000
Pokemon Stars might have both Alola and Kanto.

>>30230000
HGSS?

>>30230000
Probably just not programmed/updated yet because it's unknown?