Since it's a Kanto Pokemon, it must be traded from FR/LG.
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safari zone
beta the elite four and go to the closed spot in the safari zone
You can find some Kangaskhan in the Great Marsh, so be sure to look from the second floor of the Observation Deck of the Great Marsh to find areas where Kangaskhan can be found.
you find kangaskhan in area 2 of the safari zone in Pokemon leaf Green ... not sure in fire red sorry
you need to find it in the safari zone in area1.