This has been my 2nd favorite christmas event (nothing beats the north pole dungeon). Actually making catching pokemon fun and having the definitive end. Plus opening pokeballs is just good mechanic
Metagross probably because of the typing (a lot of teams have fire/ground/fighting moves which will make me use trick and it can tank most, if not all of them). In my team I also have gothitelle, most certainly not the best, but it helped me with figuring out every ability/item each team has so I use it just because I have it