Only if you have beaten the game legitimately and want to mess around. Using a trainer before experiencing the story or Zombies Easter eggs robs you of genuine challenge and discovery.
: Using trainers in public lobbies or online multiplayer can lead to a permanent ban from Activision or Steam.
Using trainers carries significant risks, especially for games with online components like Call of Duty :
: The impact of trainers on the security and stability of peer-to-peer (P2P) sessions. Conclusion
For a paper focused on the Call of Duty: Black Ops 3 V100.0.0.0 Trainer
: Options often include "Easy Kills" or unlimited points to unlock doors and pack-a-punch weapons instantly. Security & Stability Considerations