I played a bit of Black yesterday, as my cousin's oldest son has the game (a hacked version so it's super-easy for him because he doesn't know how to read and doesn't want to learn), and he wanted me to hunt down an Axew. So, I did, but while doing so, I used his very few items to replenish the health and moves of his shiny Arceus, and the whole time he was freaking out because I allowed Arceus to take two hits so I could give him a Leppa Berry so he could attack again (ExtremeSpeed had no PP, along with all his other moves).
Eventually, I managed to find the right cave and go grind for a bit and catch an Axew. After that, his Arceus had nearly-full health, I increased ExtremeSpeed's PP, and replenished Hyper Beam. Found the kid three items, as well.
His mother and I tried to no avail to explain to him that in order to be able to play Pokemon, it helps if he knew how to read. Right now, he identifies controls by color, moves by how they're arranged, and he can't use the town map and doesn't know how to use items.