My starters (First time) were as follows,
Gen 1: Squirtle
Gen 2: Chikorita
Gen 3: Treecko
Gen 4: Chimchar
Gen 5: Snivy
Gen 6: N/A (Never played, but I believe my choice would have been Fennekin)
One thing I've kept constant was to catch that region's first flying-type pokemon, which would usually be my Fly pokemon for the duration of the playthrough.
I wouldn't call myself a shiny collector/hunter. As like Hilda said, if i find one, i catch it, but i won't go out of my way to hunt one down.
I never really got into growing berries. I never really thought it to be worth remembering to go back and pick any berries I may have planted before.
I may not be competitive, but I have become increasingly aware on the differences nature, IVs and EVs make over the course of the generations. While I do recognize their potential, I don't usually fret over them too much. Nature is the only one of these I pay significant attention to.
I have not yet been able to experiment with Mega-evolutions. As i stated before, I have not played generation 6.
While I do go out of my way to battle trainers early-game, this resolve tends to deteriorate as I progress through the game.
I don't tend to make a well-built team until post-game, as I usually prioritize getting accessibility to the entire region. Of course, this isn't and could not be the case in Reborn.