Russell Westbrook and Kevin Johnson were tied for the most games with 35+ points and 20+ assists, with 1 game.

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who has the most career games with 35 points, 20 assists
Interpreted as:
Who has the most career regular-season games with 35 or more points, 20 or more assists?
Russell WestbrookRussell Westbrook1352139.335.
Kevin JohnsonKevin Johnson1372042.
StatMuse has game-level data for assists going back to the 1982-83 season.