While crossing route 101 I met up with Birch. He complimented me on my progress. Said that I still had a very long way to go, that I needed to search the tall grass more thoroughly.
He was however extremely surprised ny the fact that I had managed to catch and evolve an Eevee already. So much so, he gave me a new specimen as a reward.
I was so surprised that I couldn’t stop myself asking if he would give me a new one for every one I evolved. He smiled mysteriously and went back to his lab.