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Guys, just because a Pokemon was first seen in region X, doesn't mean it is only indigenous to region X. It was just first seen by players in that particular region dex.
For D/P, the region dex of 151 is what is indigenous to Sinnoh. The "new" Sinnoh Pokemon in that dex are just being seen there by the player for the first time. Milotic is from Sinnoh as much as it is from Hoenn.
