We know that team rocket's attemt to come back in jhoto happend after kanto .but what about hoenn , sinnoh , galar and alola? . Did they happen alongside kanto or jhoto .
Actually, I’ve got a different answer.
The plot of Pokémon Ruby and Sapphire and Pokémon Red and Green are contemporaneous. They are then followed by the equally contemporaneous plot of Pokémon Gold and Silver and Pokémon Diamond, Pearl, and Platinum, which are set three years later. Pokémon Black and White are set an unspecified amount of time after those games. Pokémon Black 2 and White 2 are set two years after those games, and are contemporaneous with Pokémon X and Y. Pokémon Sun and Moon and Pokémon Ultra Sun and Ultra Moon take place two years after the events of Pokémon Black 2 and White 2 and at least 10 years after the events of Pokémon Emerald.
Source
Hope this helps! :)
Far aas I know Kanto Jhoto Hoenn Sinnohl Unova Kalos Alola Galar