I've been disappointed with the "My Very Own Mew" event in my Pokemon Violet game. That was because it, in fact, wasn't my very own Mew. I always give my Pokemon nicknames to make them more unique. When I checked the summary of the Mew, I found I wasn't registered as the OT (Original Trainer) of the Mew, which meant I was not allowed to change its nickname, which left it permanently set to "Mew". I was extremely upset with this. Please, change this in the future!