From PokéHeroes Wiki
Milcery can evolve into a lot of different formes, depending on the time of day, the speed the wheel is spinning at and the direction of the spin. The Sweet its holding decides the accessory, but those are not separate Dex entries. You can compare them to male/female specific sprites.
These last two are decided by the Pokémon you choose to spin. The gender decides the direction, the Speed stat decides if it’s slow or fast. Genderless is used for one specific evolution forme.
Here is a table with the formes and which time/gender/speed combo is necessary to get Milcery to evolve into that forme.