Hello, I'm an expert in the field of Pokémon evolution. When it comes to the evolution of Cherubi, it's a straightforward process within the Pokémon universe.

Cherubi evolves into Cherrim through a process that is unique to this particular Pokémon species. Cherrim's evolution is not based on leveling up like many other Pokémon, but rather on the time of day. Cherrim has two distinct forms: the "Sunshine Form" which it takes on during the daytime hours, and the "Overcast Form" which it assumes during nighttime or when the weather is cloudy.

Here's the step-by-step evolution process:

1. Cherubi must reach a certain level of friendship with its trainer.
Friendship is a mechanic in the Pokémon games that represents the bond between a Pokémon and its trainer.
2. Once the friendship level is high enough, Cherubi will evolve into Cherrim automatically when the time of day changes to morning, assuming it's a sunny day. If the weather is overcast or it's nighttime, Cherrim will revert to its "Overcast Form."

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Cherubi (Japanese: �������� Cherinbo) is a Grass-type Pok��mon introduced in Generation IV. It evolves into Cherrim starting at level 25.read more >>