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I think when you get all of the 8 badges in the johto region and beating the Pokemon league for the first time.
Chansey may rarely be found on Routes 13, 14, and 15, which are found east of Fuchsia City in Kanto. Kanto can only be accessed after beating the Pokemon League.
after beating the Pokemon league, getting the national-dex, beating jhoto, beating kanto, and sighting all the Pokemon in the national dex.trust me, i all ready got five stars and here is proof=*****cya!
you get in kanto after beating lt.surge of vermillion gym
I believe that you can get to Kanto after defeating the Pokemon league and getting the National Pokedex.