Your words carry great truth. It was incredible.
Let us go over all the epic things.
- First of all, the story concerning Wallace, Archie and Maxie. It is good story right there, and very appropriate prior to the final battle -- more than the Champion simply congratulating the player.
- Damage defeated a Primordial Sea Palkia.
- How poetic was it that Mavis, the very first Pokemon Thamill caught, turns out to be the secret Mega? And this was Mega Milotic Y, so that means there is likely a Mega Milotic X, too.
- Shmurda Transforms into Mega Milotic Y, standing up to that monster when no one could. The entire team was too weakened. Even with Full Restores, Cross and Damage would have been OHKOed, and Mavis would not stand a chance. And then, Shmurda sacrifices herself. Right as she dies, she takes Mega Milotic Y down with herself, dying so no one else has to.
- And finally... the dead Pokemon, including W and Shmurda, are remembered in the Hall of Fame for their great sacrifices. After all, if not for W and Shmurda, the team would have been killed by Meloetta or Mega Milotic Y.