Nintendo revenues per generation

[TWRoO]

Don't forget that includes handhelds.

The GB during SNES.
The GBColour during N64 (about N64 launch was when Pokemon surged so GBC + GB stopped N64 years falling below SNES years)
The GBA during GC
The DS across later GC and then Wii era.

The huge revenues now are a result of two huge successes at once.