Alright, now THIS is big news for my game. I went to the 4th gym leaders gym then I lose, so I grinded up most of my Pokemon to the late 20s, and then my Magnemite evolves into a Magneton and my Sandile evolves into Krokorok. And so I went in the gym again, lose, and do it again and win and my Golbat evolves into Crobat. And so I went to the next city and immediately went to chargestone cave and evolved my Magneton into a Magnezone.