[Question] Is it legal to make a Fanmade Pokemon Animation

Hello!

I want to make a Pokemon animation on YouTube. I am wondering if this is legal to make any. I won't sell it or claim Pokemon as my own.

Thank you!

You won't get in trouble. Countless people make Pokemon fanart and animations, and they are left alone. However, Nintendo may put a copyright claim on the video, so if you decide to turn ad revenue on, they would get the money instead.

Is it specifically legal? No. Technically, producing and releasing material based on copyrights you don't own is against the law. But again, Nintendo/Game Freak/Pokemon company aren't going to care.
The following site goes into more detail, and is a good read on the matter.
https://www.plagiarismtoday.com/2010/05/13/the-messy-world-of-fan-art-and-copyright/