Basically Nintendo tries to twist the laws in their favor even when fair use is in play, this basically locks the videos from ever giving you any ad revenue or if you give in, then Nintendo will forcefully put ads in your video, regardless if you want them or not.
On the other hand, Nintendo tries to use the law and tell people that any form of using their content in any way (Fan projects, Emu, roms) are wrong, but will have no trouble doing everything in their power to fuck you over if there's a 2 second clip of pokemon in your video, even if it's fair use. They steal from you, but do everything in their power to stop people stealing from their them.