It’s hard to choose for me I grew up with the original 3 movies so they will always have a spot in my heart.
Now as time went on theykept making more and to me they started to get old.
I did not like Pokémon I choose you. I hate when a franchise just randomly decides to redo a series cause it’s hard to forget what had come before so it confuses people.
Now as far as my favorite it has to be Lucario and the Mystery of Mew. All because of Lucario. Nuff said.
Pokemon The Movie 2000, I think that's the one I saw in the theater as a kid. But I love the first 3 movies pretty equally, due to nostalgia and because they're really good
I haven't seen all of them, but the very first movie (Mewtwo Strikes Back) still makes me cry to this day. I also really love the sequel special (Mewtwo Returns). I think Mewtwo's character is an important one to the series, and appreciate that there were different opportunities to explore it!
Mine is definitely Pokemon: The Rise of Darkrai. I started Pokemon with the fourth generation, and I really just loved everything about this movie in particular.
Probably the first one. It's the one with the most interesting and intense story for me, with Ash getting literally "stoned." Man, that was tearjerking.
I also like the Japanese theme song from Jiraichi: Wish Maker. I would always listen to it every now and then. Quite an emotional song.
I've only seen the first five Pokemon movies, but of those five, I would say the 3rd one (Rise of the Unown: Entei) was my favorite. It helps that it's the one I can vaguely remember the most, lol.