What are your favorite mythicals and why?

My all time favorite is Manaphy. Doing the Manaphy egg mission in Ranger, transferring it over to Diamond, and finally hatching it were incredibly rewarding. Manaphy was my first mythical, so I didn't know they couldn't breed. One of the first things I did after it hatched was toss it into the daycare so I could get more Manaphys. And then being surprised when I hatched a Phione instead of a Manaphy.

My second favorite is Meltan. The day he first was appearing in the game I was out playing the game with some younger relatives. Even though they were just Dittos it still gave me a feeling I hadn't had in a long time. I remember a younger cousin of mine asking me what it was, and not having any idea. That surprise of a never before seen pokemon just appearing was something I hadn't had since I was a kid.