Combee can only evolve into Vespiquen under specific circumstances in Pokémon BDSP. It takes a female Combee for it to become Vespiquen.
Combee is a Pokémon with a unique evolutionary method to transform it into Vespiquen in Shiny Diamond and Shiny Pearl Pokémon. This generation introduced the world to new evolutions of older Pokémon like Mamoswine and Porygon-Z, but it also included dozens of new Pokémon. Fan favorites like Rotom and Lucario debuted in the original Diamond and pearl pokemon in 2006. Creatures like Mothim and Wormadam require players to find Burmy, a special Pokémon that can only be found one way. Aside from trading with a friend, Burmy is a Pokémon that can only be found by placing honey on trees. After 6 hours have passed, the tree has a chance to spawn a random Pokémon, some of which can be incredibly rare to find. These encounters include Combee, a Pokémon that debuted in Diamond and Pearl Pokémon. Trainers wishing to add his evolution, Vespiquen, to their collection will need to stock up on honey.
Fortunately, Pokémon BDSP offers two ways for players to get their hands on Combee. The first is through the honey tree method. There are 21 honey trees scattered throughout the Sinnoh region. Coaches should head to Floaroma Meadows and speak to the man in town. The game allows them to buy up to 10 honey at a time. Use this for more chances to find Combee. If players are running out of cash, they can use VS Seeker to rematch the coaches. These rematches will continue to provide the coaches with the prize money if they win. On the other hand, players can find a Combee once they gain access to the Great Underground. Has a chance to appear inside Grassland Cave or Sunlit Cavern.
What makes Vespiquen so difficult to evolve from Combee is its genre. Only female Combee can evolve into Vespiquen. Evolving from Combee to Vespiquen would normally not be a problem, as most Pokémon have their gender split 50% / 50%. However, when it comes to Combee, the probability of meeting a female is 12.5%, making it a difficult Pokémon to find. Players may notice a bright red dot on its head to see if the Combee is female. Once the female Combee reaches level 21, she will automatically evolve into Vespiquen.
Finding a female Combee in Pokémon Brilliant Diamond and Shining Pearl
The best place to find a female Combee will be in the Grand Underground. Since Combee can appear in Grassland Cave or Sunlit Cavern, players have two different chances of finding him in the overworld. Fortunately, the Combee will have the red dot on her overworld character model if she is a female, saving the player tons of time between encounters.
Upon entering Grassland Cave or Sunlit Cavern, scan around the room for Combee, and if it is not a woman, exit the room and return. This will re-spawn the spawns within this lair, allowing the female Combee another chance to make an appearance. Players who wish to complete their National Dex will need to collect Vespiquen and the other 492 Pokémon from this generation.
Shiny Diamond and Shiny Pearl Pokémon are available now on Nintendo Switch.