Dolphin | Ishiiruka V17 Best

: Because Ishiiruka uses aggressive hacks to achieve its speed, you may encounter graphical glitches or "broken" physics in certain games that require precise emulation.

You still need legitimate GameCube and Wii BIOS dumps (like IPL.bin for GC) and game ISOs/WBFS files that you have dumped from your own discs. Ishiiruka uses the same file structure as Dolphin.