Here's why:
* Tower Defense Mechanics: Tower Defense games focus on building defenses and strategically placing units to stop enemy waves. They don't typically include the concept of catching and training Pokémon like the mainline games.
* Game Design: Tower Defense games usually have a specific set of units, towers, and abilities that fit the game's mechanics. Adding a complex Pokémon system with types and movesets would be a significant deviation from the established genre.
If you're looking for Steel-type Pokémon, you should explore the following:
* Pokémon Mainline Games: These games offer the most comprehensive Pokémon experience, allowing you to capture, train, and battle with Steel-type Pokémon.
* Pokémon Spin-Off Games: Some Pokémon spin-off games like Pokémon Mystery Dungeon or Pokémon Ranger feature Pokémon, but they might not include all types or have the same gameplay mechanics as the mainline games.
Let me know if you have any other questions about Pokémon or Tower Defense games!