Is Wizard101 Available on Wii?

No. Wizard101 is a PC/Mac MMORPG (Windows/macOS) with a mobile companion app (iOS/Android). It has never been released on Wii, Wii U, Switch, PlayStation, or Xbox.

If you want a wizard-themed RPG on Nintendo hardware, check out Dragon Quest XI S (Switch), Ni no Kuni: Wrath of the White Witch (Switch), or Fantasy Life (3DS).