All Time Video Game Hardware Sales List:
1) PlayStation 2 (PS2) - 157,680,000 (155,000,000+ according to Sony) Mar. 31st, 2012
2) Nintendo DS (DS) - 154,900,000 (154,020,000 according to Nintendo) - Mar. 31st, 2021
3) Game Boy (GB/GBC) - 118,690,000
4) PlayStation 4 (PS4) - 116,653,889 (116,600,000+ according to Sony) - Sept. 30st, 2021
5) PlayStation (PS1) - 102,500,000 (102,400,000+ according to Sony) - Mar. 31st, 2012
6) Nintendo Wii (Wii) - 101,640,000 (101,630,000 according to Nintendo) - Mar. 31st, 2021
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7) Nintendo Switch (NS) - 94,710,234 (92,870,000 according to Nintendo) - Sept. 30th, 2021
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Switch will pass 95 million next week when Pokemon drops. And then the week after that is Black Friday and that's when its sales kick into overdrive.
PS4 is making slow but modest games, it should be close to 117 million by the end of the year.