Sadly I have rarely any one to street pass in my location, even with the new Wi-Fi distribute event for places like McDonald's where you street pass there and it records your data and when you return you will get anyone else's street pass data that passed by/entered McDonald's as well (don't know if there's other places as well) but for the most part only GameStop is the most likely spot for me as the employees have 3DS on them.
I hope Mewtwo is obtainable just like in the original Gen I game and I shall name my Mewtwo... *drum roll please!* Mewtwo! It's classic! And original to boot, what could go wrong with a name like that? ^_^
As for my Starters I'm going ALL Fire Starters, I love Fire-Types I always have ever since I laid my eyes on Charmander... those adorable eyes, the charming fang, that awesome flame on its tail, and I like lizards too as Charmander was the choice for me! Though I shall self-trade with myself as I have two 3DS and I'm getting both version (Y version (Main), Chris - Male, and X version, Iris - Female) though it's going to be a while before I trade with my other character.
PS: About my Mewtwo's actual nickname... I was thinking "Ultimax". That's a cool and kickbutt for Mewtwo.