Well...
Besides the fact that it is somewhat unbelievable that Hitler caught Mewtwo, with a Pokeball, there is nothing very interesting in this flash.
There IS a preloader, which is good, but there is no animation in the actual flash and not the beginning of it when it is saying which pokemon Hitler is trying to catch.
I recommend you put a lot more animation in the flash to improve it, as well as look at some flash tutorials.