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ive never seen a drowzee either, im almost lvl 20... eevees are pretty rare also only had enough for evolution so far. im lvl 19 almost 20 and highest cp i have is 1299 arcanine and 9xx vaporean and i evolved both of those.
When I was poking around with Pokevision (peace be upon it), it wasn't easy to find areas where Drowzees spawned with any regularity. It looked like just one patch in the whole SF peninsula, a park that abuts Sleeper Ave (HAR HAR HAR). But then, when I was flying, MSP and ORD were swimming with them at any lure or incense (oddly, those airports seemed to have literally zero natural spawns and never anything on the radar, but there were enough pokestops at misc. artwork and enough bored travelers to lure them that you had plenty to catch). So, you might try your nearest airport?