its in the title
#Rvz gamecube game files wont work with usb loader
severe gyro
woeful kiln
its in the title
you cannot play .rvz files on Wii hardware. They're for use with Dolphin only.
There's a guide to downloading and installing GameCube games pinned in #support-text
It explains what file types are supported and how to convert ISO/nkit.gcz to nkit.iso.
Nkit.iso is ideal on the Wii because it plays perfectly and is much smaller than a full ISO.
If you don't want to download a new game, Dolphin should be able to convert a .rvz to ISO. Then you can convert that ISO to nkit.iso by following that pinned guide in #support-text:
#support-text message