In Pokémon Go, Combee can evolve into Vespiquen, but it has the same requirements as it does in the mainline games: Combee has to be female. Evolving Combee into Vespiquen requires 50 Combee Candy. It will only be able to evolve if it's female.

Why does Combee not evolve in Pokemon go?

Combee is a Bug, Flying-type Pokémon from the Sinnoh region. Female Combee evolves into Vespiquen when fed 50 candies while male Combee does not evolve into any other Pokémon.

How does Combee evolve in Pokemongo?

Like Burmy into Wormadam, two more Sinnoh Bug-type Pokemon, Combee can only evolve if it is a female. Once the player has obtained a female Combee and 50 Combee candies, the players will be able to evolve their Combee into Vespiquen.