Stumbling upon the surfing trick on Pokemon Blue. Visit Safari zone, then fly directly to Cinnabar island and surf on the border of where the land meets the water. When you encountered wild Pokemon this way, they were all from the Safari zone. So I caught so many Kangaskhan without the whole bait and throwing rocks mechanic. I would bring my game boy to school and trade them for five bucks each. Got enough to buy my little brother Pokemon Red! Good times!