Where are the ingame save files on my laptop?

[Helios]

For GameCube games: C:\Users\(user)\Documents\Dolphin Emulator\GC - sorted by region. If you just play north american region games or NTSC, it'll be in USA. PAL is EUR.

Wii is stored on emulated NAND so I'm not sure how useful that'll be to you, but C:\Users\(user)\Documents\Dolphin Emulator\Wii