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Here's a hint: Rarer Pokemon take longer to find. If you're going for the best time, you may want to go for sending over common/uncommon Pokemon. If not, send over anything you want.
You can find this information on serebii. I believe it might've been in the mountain (rock) area. If you're running low on ideas, try looking for a starter of any kind (Johto Preferable/can be any starter though).