The Professor Willow Assistant Pikachu Pokemon GO costume makes its debut during the Willow’s Birthday Research event, giving Trainers another limited-time Costume Pikachu to add to their collection.
Available for just one day, this special Pikachu celebrates Professor Willow’s birthday by dressing as his assistant and can be obtained through several event activities, including Field Research, Timed Research, snapshot encounters, and raids.
Here’s everything you need to know about Professor Willow Assistant Pikachu in Pokémon GO.
How to Get Professor Willow Assistant Pikachu Pokemon GO
Professor Willow Assistant Pikachu is available during the Willow’s Birthday Research event.
The event runs:
Tuesday, July 21, 2026
10:00 a.m. until 8:00 p.m. local time
During the event, Trainers can encounter the costume Pikachu through multiple methods, making it one of the more accessible event Pokémon released during Pokémon GO’s anniversary celebrations.
Ways to Encounter Professor Willow Assistant Pikachu Pokemon GO
Throughout the event, Professor Willow Assistant Pikachu can be found by:
- Completing free Timed Research
- Completing event-themed Field Research
- Taking event snapshots
- Participating in featured raids
Because there are several encounter methods, players have multiple opportunities to catch the costume throughout the day.
Can Professor Willow Assistant Pikachu Be Shiny?
Yes.
If you’re lucky, Professor Willow Assistant Pikachu can be encountered as a Shiny Pokémon.
As with previous Costume Pikachu releases, Shiny encounters are not guaranteed, so Trainers may need to complete multiple research tasks or raids before finding one.
Shiny Costume Pikachu remain some of the most desirable collectibles in Pokémon GO due to their limited availability.
Have You Collected Them All?
Keep track of all Costume Pikachu with our free collection tracker. Your progress is saved automatically, just bookmark the page so you can come back whenever a new event arrives.
Can Professor Willow Assistant Pikachu Have a Special Background?
Yes.
During the event, lucky Trainers may also encounter Professor Willow Assistant Pikachu with a Team Leader-specific Special Background.
These exclusive backgrounds make the Pokémon even more collectible for players who enjoy hunting unique event variants.
Willow’s Birthday Timed Research Rewards
Every Trainer receives free Timed Research during the event.
Rewards include:
- Encounters with Professor Willow Assistant Pikachu
- 1 Lucky Egg
- 1 Star Piece
- Additional event rewards
Remember that the Timed Research expires, so all tasks must be completed and rewards claimed before the deadline.
Field Research Rewards
Special event-themed Field Research will also be available.
Completing these tasks may reward Trainers with:
- Professor Willow Assistant Pikachu encounters
- PokéCoins
- Lucky Eggs
- Additional event items
Field Research provides another excellent opportunity to search for Shiny and Special Background versions of the costume Pikachu.
Is Professor Willow Assistant Pikachu Worth Catching?
Absolutely.
Even if you already own several Costume Pikachu, Professor Willow Assistant Pikachu is unique to the Willow’s Birthday celebration and is expected to become one of the more memorable anniversary costumes.
Collectors may also want to hunt for:
- A Shiny version
- A high IV version
- A Special Background version
- A Lucky version through trading
Since Costume Pikachu don’t always return, catching several during the event is recommended.
Will Professor Willow Assistant Pikachu Return?
Niantic has not announced whether Professor Willow Assistant Pikachu will return after the event.
Some Costume Pikachu return during future anniversary celebrations, while others remain unavailable for years.
Until another appearance is confirmed, Trainers should treat this as a limited-time opportunity.
Professor Willow Assistant Pikachu Pokemon GO – Frequently Asked Questions
When is Professor Willow Assistant Pikachu available?
Professor Willow Assistant Pikachu is available during Willow’s Birthday Research on Tuesday, July 21, 2026, from 10:00 a.m. to 8:00 p.m. local time.
Can Professor Willow Assistant Pikachu be Shiny?
Yes. Trainers have a chance to encounter a Shiny version throughout the event.
How do you get Professor Willow Assistant Pikachu?
You can obtain it through Timed Research, Field Research, snapshot encounters, and featured raids during the event.
Can Professor Willow Assistant Pikachu have a Special Background?
Yes. Lucky Trainers may encounter one with a Team Leader-specific Special Background.
The Professor Willow Assistant Pikachu Pokemon GO debut is one of the highlights of the anniversary celebrations, giving collectors another exclusive Costume Pikachu to chase. Whether you’re hunting a Shiny, a Special Background variant, or simply adding another unique Pikachu to your collection, this one-day event is well worth taking part in.
