John Stockton had the most games with 25+ assists, with 3 games.

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who has the most 25 assist games in a career
Interpreted as:
Who has the most 25 or more assist regular-season games in a career?
StocktonRondoKiddJohnsonSkilesMcMillanThomas3111111
NAMEGPASTMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBSTLBLKTOVPF+/-
John StocktonJohn Stockton38140.018.33.027.04.00.03.07.311.066.70.32.016.73.34.083.3120559120912
Rajon RondoRajon Rondo12530.32.07.025.01.00.03.01.05.020.00.01.00.00.00.030271034+28
Jason KiddJason Kidd12549.020.04.025.04.00.05.06.017.035.33.010.030.05.09.055.6492044054
Kevin JohnsonKevin Johnson12541.016.03.025.00.00.04.05.012.041.70.00.06.06.0100.0411630042
Scott SkilesScott Skiles13044.022.06.030.02.00.04.07.013.053.82.03.066.76.07.085.7442262042
Nate McMillanNate McMillan12541.08.08.025.01.04.03.03.05.060.00.01.00.02.02.0100.041881432
Isiah ThomasIsiah Thomas12541.023.05.025.02.00.05.010.018.055.60.01.00.03.05.060.0412352054
StatMuse has game-level data for assists going back to the 1982-83 season.