Never evolving it yet leveling it up and using it? I know statwise it's stupid but maybe someone would like that pokemon so much that they don't want to evolve it This also goes fo their second stage. *coughGravlercough*
I used to keep some of my Kanto starters in their first stage because they were my fav Pokemon at the time, but I don't anymore. Sadly now I care too much about stats...
Well, I often keep Bulbasaur and the Hoenn starters unevolved until the E4. I also keep Dragonair, Pupitar, Shelgon and Metang unevolved until they get into their 90s.
I rarely use the starters. But once I picked Charmander, because of Suicune, and kept it as as a Charmeleon. It just looks cooler but I dont like Charizard anyway.
Nope never, Not with a starter, but with Onix, Gravler, Poliwhirl and so on (all the ones where you had to do something other than leveling up to evolve)
I have LG version and I juste restarted a game, I plan on keep Ivysaur because I'm not a fan of Venusaur. I'll keep Dragonair too. I think keep some form make just the game a little more difficult. I like that