Are TMs Single-Use in Pokemon FireRed?

Yes. In Pokemon FireRed, TMs are single-use items.

After teaching a move, that copy of the TM disappears from the TM Case and cannot be used again.

The same rule applies in Pokemon LeafGreen.

Why This Feels Uncertain#

The game never clearly explains how reusable TMs are, which is why they are often listed among the limited items and one-time rewards in Pokemon FireRed.

Players may notice that HM moves can be used repeatedly, which makes it easy to assume TMs might work the same way.

Later Pokemon games changed the system so that TMs can be used multiple times. Because of this, players who are familiar with newer games may hesitate before using a TM in FireRed.

This hesitation usually appears when players are unsure whether the TM can be used again later.

What Actually Happens#

In Pokemon FireRed:

A TM can normally be used one time
After teaching the move, the TM disappears from the bag
The same copy cannot be used again

If another copy of the same TM exists somewhere else in the game, it will appear separately in the TM Case.

Otherwise, the move can only be taught once during the playthrough.

In Short#

TMs in Pokemon FireRed are single-use items.

After a TM is used to teach a move, that copy disappears from the inventory and cannot be used again.