I just felt that I needed to share this with somebody. I was playing Pokémon Red on my 3DS the other day. I had caught myself a Staryu and was of course planing on evolving it. I decided to was train it a little before evolving it, and then all of the suden after a battle on Route 15 it levled up to lv 23 and evolved!
So...why did this happen? I didn't use a Waterstone, i didn't even have a Waterstone. My Staryu just evolved for no reason.
Is this a common glitch in gen 1 that i'm just not awer of? Has this happend to other people?