If you cannot find a stable Shockwave 1.2 trainer, or you fear viruses, consider these built-in options:

The Shockwave mod (current version 1.201) is a major overhaul that adds over 100 new units, new structures, and redesigned generals like Deathstrike

Do use random “trainer download” sites (CheatBook, TrainerCity, etc.) unless you have a good sandbox/VM.

Since Shockwave is a mod, traditional trainers for the base Zero Hour game often crash. Here are the safest ways to "train" or modify the game: