i'm in your conscience
If I'm doing a challenge and can't evolve something, then yeah. Or if I'm waiting to evolve because I want to learn a move first. But most of the time, I don't use it. I think I kept one on my Timburr my first time in White though, cause I really like Timburr haha. I used to use it when RNGing eggs, but it made things more confusing in the long run, so I scrapped it.