"Pokémon that originate from a different region than it's introduced generation"

What Pokémon do you think are from a different region than their introduced generation? (Going by the video games)For example, Slugma could have originated in the Hoenn region despite being from gen 2, as in GSC they were only found very rarely in Kanto's Route 16, 17, and 18. Routes that have no fire or lava in sight, suggesting they were brought over from Hoenn between RBGY and GSC. In the Hoenn region they are in their native habitat, a volcanic mountain.Also in Unova you get Larvesta as an egg and Volcarona as a single special encounter. The only place with wild Larvesta so far are the mirage islands around Hoenn, so Larvesta and Volcarona could be species from islands around the Hoenn region. (Not counting the friend safari as it seems more artificial) via /r/pokemon http://ift.tt/2oCLhid