The fan-made ROM hack, Destiny: Life of a Guardian, is based on Pokémon Ruby, but it modifies the game with new features and changes, potentially including different TM locations or even new abilities.
However, without a specific walkthrough or guide for Destiny: Life of a Guardian, it's impossible to tell if Strength is available in the game and where you might find it.
If you want to learn where Strength is in the original Ruby game, here's where to find it:
* Route 110: You can find Strength TM outside the entrance to the cave where you battle Flannery.
Remember, this information is for the original Pokémon Ruby game and may not apply to Destiny: Life of a Guardian.
To find Strength in Destiny: Life of a Guardian, you'll need to consult a specific guide or walkthrough for the game, or perhaps ask in a forum dedicated to the ROM hack.