Answered March 30th, 2019

Jonas Valanciunas is the first Grizzlies player with a 30p/20r game since Z-Bo in 2012.

Who was the last Grizzlies player with 30 points and 20 rebounds in a game?
Interpreted as:
Who was the last Grizzlies player with 30 or more points and 20 or more rebounds in a game?