No.
You can download the Youtube application from the eShop if you want to watch Youtube videos, you can not watch video files such as mp4s, but if you upload them to Youtube you will be able to watch them :)
You can't :(
Yes you will be able to do that and you will also be able to watch youtube videos.
Yes, but if you want to watch YouTube videos, you will need to download the YouTube app from the Nintendo eShop first (at no cost).
unfortunately, no
Yes
You will need to go to the Nintendo eShop and download the YouTube app with no cost. Then, when it finishes downloading, you will be able to search for any YouTube video.
There is always a client for your favorite app or service for different platforms or devices. The main thing is to try to find information on the Internet for the query you are interested in. If you want to always have access to your channel and promote it, then there is a special service lowcostsmm, where you can get views, likes or subscribers for YouTube from live people or bots.
Yes, the 3DS can be used to watch YouTube videos. However, the YouTube app needs to be downloaded first from the Nintendo eShop (at no cost).
No. The 3DS does not have the processing power to access YouTube, Vevo, Fuse.tv, or any other websites that have music videos, let alone even play a video at all. It's just not what the 3DS is meant for.
At the moment the 3ds internet system update hasn't been released but sometime in late may it will come out. EDIT 3DS browser can not view YouTube, so no. If you want to view in 3D go on YouTube videos that say 3D and either use red/blue glasses or a 3DTV.
Yes, when you open the Nintendo eShop, under the videos category, you will be able to watch Pokemon