Last starters I actually used were Treecko and Charmander, and if we're talking "Chose in their actual game", then Treecko. "
Besides personal reasons- Idc about the any more. They're another classic staple/cliche that could always use tweaks for freshness every now and then.
Rivals, starters, no voice acting, "can't ride that bike here dude!" , "Adventure ",....
BWAAAHHHH!