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Your Poke-walker in Suburban Area, or breed an Electabuzz (catch in Kanto's power plant)
Trade dratini from firered or leafgreen to ruby.
You can get a Munchlax by breeding it with Snorlax holding a Full Incense, or you could transfer it from the Poke Walker.
Slot Machine
You can catch Dratini in the Dragon's Den by surfing or fishing in the water. Additionally you can fish in Route 45 Keep in mind the encounter rate for Dratini is more uncommon than that of say, Magikarp.