RMMV- Skills that will be usable only in specific round(s) of battle

Greetings,

I would like to ask if its possible to do that some skill will be available to use only in specific round of battle without needing any additional plugin. If its not possible is there any plugin that will give me the opportunity to do that ? I already tried to find something but without any success.

Thanks for reading.

Just run an event under troops that adds a count once per turn, and then a conditional branch based on that count, have it add or remove a skill.

Thanks a lot.