The Predator (Yautja) is not a playable character in any Call of Duty game on Wii (or any platform).
Wii CoD games are ports of previous-gen (PS3/360) titles with reduced features. No DLC support. No crossover characters.
If you want to play as Predator: Predator: Hunting Grounds (PS4/PC) (Asymmetrical multiplayer), Mortal Kombat X / 11 (DLC), Ghost Recon Wildlands (Mission), or CoD Ghosts/Mobile/Warzone (Skin only).