I really like this series, and have started collecting DVDs and VHS tapes of the series, and I decided to watch this a bit after getting it.
I like the music in the film, and the artwork including the CGI bits look great, and even though it takes about 30 minutes or so to reveal the main focus of the film, Manaphy, I feel like the amount of time taken was acceptable, as it built up suspense for me, and even though the main plot was basic, involving the Pokemon Rangers having to protect the Pokemon and prevent a pirate guy I forgot the name of from stealing the Manaphy Egg, and a thing about the sea temple, but ultimately, I didn't find it that bad, and I think one of the best things involving this movie, is the chemistry between May and Manaphy, seeming a lot like a mother daughter relationship, and I love how Manaphy is similar to an actual infant, since he had just hatched from an egg not long ago around the 32 minute mark, and even though the movie was around 1hr 45min, I felt it was a bit short, compared to other movies I have, I don't think this overstayed its welcome too much, and even though I am glad the entire movie wasn't focused on May and Manaphy, I wish that they were focused on a bit more throughout the movie, but I wouldn't want the movie to focus on 3 or more different plotlines that try to fight with each other, so its ok with me.
I find this movie a great casual watch in general, personally I would watch this again, but in PSVR, since I watched this first on the TV, the movie is just that great that I would want to watch again.