Wow nice, that would be really cool. Yeah it will def take me a little while to get those two for ya so you'll have plenty of time to find those I would like..
Lets see, I think, if you can manage a 6IV Shiny Noibat with Timid and Infiltrator that'd be awesome. Not sure if you can do for specific genders or not if so, preferably female.
However, if that is too much, then honestly a Shiny Careful, Phantump with Natural Cure would be pretty awesome as well. I would like him nicknamed, but I'm not sure what name Id want on it yet so I an get back to you on that when I think of something for either one of these options.
Btw, can you tell me the IV spread that Sandshrew needs to be? I'm not familiar with its spreads and I def want to make sure they are what you are needing. Also, I assume you don't need specific egg moves on them? And do you need any specific egg moves on it? Any preference on gender or Pokeball?
I am noticing there doesn't seem to be a way to obtain Bouffalant right now in-game so that one will have to wait till pokebank opens unless I'm overlooking something on it's obtainable location.
I can get you a 6 IV Shiny Noibat with Infiltrator and 5/6 IV Shiny Careful Phantump but I won't be able to nickname them since they are not mine. Also, Sandshrew's prefered nature is Jolly/Adamant so I want it's spread to be 31/31/31/x/31/31. I only really need Rapid Spin as it's egg move :)