Try it out, thundrio, and see what happens. Post anything important here for later reference.
I have to warn you that the RNG is going to be bad. This is rather presumptuous on my part, but I claim it is justified. I'll leave out the details, but check the Diamond/Pearl thread if you're interested.
If you're going to do the Japanese version, I assume you have Pokemon experience of any kind. If you have questions, you can ask here, but remember that most of us have no experience with Black/White so we won't able to tell you where to go.
If you've played Pokemon before, a lot of stuff should be rather logical at first. If your attack misses, it's pretty obvious. Critical hit should be obvious by testing but if you can't tell, きゅうしょに あたった is the Japanese.
The attacks are in Japanese but you don't really need to know that. All you need to know is that the attack is there and you use it. Most of the basic ones early on are Normal-typed and things like Tackle (which in Japanese is たいあたり). But really, you can guess at what sort of effect an attack does by seeing what happens when you use it. If it is super-effective, it obviously does a lot of damage plus there is a "it's super effective!" (can't remember the Japanese).
If you really need to know the exact name of a Pokemon or attack, use the hiragana chart to decode the Japanese:
http://www.saiga-jp.com/img/character/japanese_language/hiragana_katakana_list.gif
then search it, or post in this thread if you can't find out. But don't post here with "the pokemon with the two wierd u symbols in his name", because we probably aren't able to figure out what you mean.
Also make use of
Bulbapedia and
serebii.net. And Youtube.
