Whenever Pikachu comes across something new, it blasts it with a jolt of electricity. If you come across a blackened berry, it's evidence that this Pokémon mistook the intensity of its charge.
Pikachu seems to be common Pokémon during some events, however aside from them it is very-rare Pokémon.
From December 12th, 2016 to January 3rd, 2017, a Pikachu wearing a festive Santa hat was available to be captured in the wild during the Holiday event.
Pikachu with the same festive Santa hat was available again with exclusive move - Present to catch on the 2nd Holiday event, from December 21st, 2017 to January 4th, 2018.
Pikachu with the same festive Santa hat was available again to catch on the 3rd Holiday event, from December 18th, 2018 to January 2nd, 2019, but this time with possibility of catching the shiny variant as well. However, Pikachu didn't learn Present this year.[1]
From February 26th to March 6th, 2017, a Pikachu wearing a party hat was available to be captured in the wild to celebrate Pokémon Day.
Pikachu with the same party hat was available again to catch on the 2nd Pokémon Day event, from February 26th to 28th, 2018, but this time with exclusive move - Present and possibility of catching the shiny variant as well.
From July 6th to July 27th, 2017, a Pikachu wearing a Pokemon League hat resembling the one that Ash Ketchum wore in the animated series was available to be captured in the wild to celebrate the 1st Anniversary.
From April 1st to April 2nd, 2019, Pikachu with the same hat could be encountered five times per day in GO Snapshot with possibility of catching the shiny variant.
From October 20th to November 2nd, 2017, a Pikachu wearing a witch hat was available to be captured in the wild during the 2nd Halloween event.
Pikachu with the same witch hat was available again to catch on the 3rd Halloween event, from October 23rd to November 1st, 2018, but this time with possibility of catching the shiny variant as well.
On January 20th, 2018, Pikachu was the Pokémon available to catch with an exclusive move - Surf, during the first Community Day.
From July 5th to July 31st, 2018, a Pikachu wearing a summer hat and sunglasses was available to be captured in the wild to celebrate the 2nd Anniversary.
From October 6th to October 7th, 2018, a Pikachu wearing a Fragment hat (design by Hiroshi Fujiwara) was available to be captured, there was a possibility of catching the shiny variant as well.
On October 11th, 2018, spawn rate of female Pikachu was higher during the Female Day.
Between November 30th and December 3rd, 2018, Pikachu's spawn rate in the wild was significantly higher during twelfth Community Day.
From February 26th to February 28th, 2019, a Pikachu wearing flower crowns was available to celebrate Pokémon Day with possibility of catching the shiny variant.
From May 7th and May 17th, 2019, a Pikachu wearing detective hat could be encountered once per day in GO Snapshot during the Detective Pikachu Celebration.
Gallery
Pikachu Pokédex entry
Pikachu seen in the game trailer
Pikachu in early concept of encounter screen
Sprites of Pikachu with event hats
Regular male
Shiny male
Regular female
Shiny female
Festive
Ash
Party
Witch
Summer
Fragment
Winter
Flower
Detective
Trivia
Pikachu was released with the game launch on July 6th, 2016.
In the wild, maximum capture CP of Pikachu is 804, however it can reach 871, if encountered Pokémon is boosted by current weather.
From July 6th, 2016 to December 12th, 2016, Pikachu used to be a possible hatchling from 2-km Eggs.
Pikachu was available in field research: "Catch 3 Electric-type Pokémon." during April to June, 2018 with a maximum capture CP of 402.
Pikachu was also available in field research: "Catch 3 Grass-, Fire- or Water-Type Pokémon." during July, 2018.
Flower crowns Pikachu was also available in field research: "Catch 5 Pidgey or Rattata." during Pokémon Day 2019.
It has a lineup of various costumes for certain events in game.
Along with extra-small Rattata, extra-large Magikarp and extremely-rare in general Unown, for catching Pikachu there is special medal that Trainer can achieve.
Pikachu can be caught as a Starter Pokémon, if the player walk away from three already spawned Starter Pokémon to make them disappear and re-spawn again next to the trainer at his current location. Players have to repeat this action few times until Pikachu show up along with the previous three Starter Pokémon.
Unlike the other Pokémon in the game, if Pikachu is tapped while looking at its summary page, it says its name just as it does in the anime series.
in Main Menu 
in 
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