John Frusciante’s Electro-Harmonix “Black Russian” Big Muff Pi V8access_time First seen circa 1999
This pedal was seen on photos taken of John’s pedalboard during the Californication tour. It is unknown at this point for which exact songs he used it live, and whether it was used at all in the studio.
In case you’re curious about the pedal, according to this page about History of the Russian Big Muffs, this V8 version that John used is the last of the original Russian-produced Big Muffs (the pedal was reissued in 2017). It was made in St. Petersburg, in a smaller enclosure than the previous versions, and one could only power it through a 9V battery (no actual power input like on modern pedals).