From Bulbapedia, the community-driven Pokémon encyclopedia.
Mistralton Tower (Japanese: フキヨセタワー Fukiyose Tower) is a landmark in the Unova region that is exclusive to the Pokémon anime. It exists along Route 7. A festival is held in its honor as well as a contest. Those who win the contest will have a chance to ring the bell at the top of the tower and make their potential wishes come true.
It is nearly identical to the Celestial Tower in design and location. However, it is not a cemetery for Pokémon as it is in the games.