To post requests, try the Japanese version first yourself.
Then prepare a nice attractive overview of the game, why it won't be officially localized, and why it should be translated because it's good and has lots of qualities (you'll talk about) and not simply "I like it/millions like it/people ask for it", how you can help, lots of shiny images ...
You need to spend time to convince potential translators and get them to be...
[THE] 3DS Translation Request Topic
Then prepare a nice attractive overview of the game, why it won't be officially localized, and why it should be translated because it's good and has lots of qualities (you'll talk about) and not simply "I like it/millions like it/people ask for it", how you can help, lots of shiny images ...
You need to spend time to convince potential translators and get them to be...
[THE] 3DS Translation Request Topic