I'm making a game with a flashlight in it and I don't know how to make the flashlight flicker, I've tried using ghost blocks but they didn't work that well. Any suggestions?

Perhaps you can use the show and hide block rapidly. It will create a flicker effect.

If the light is a separate sprite then you can use the ‘hide’ block, wait 0.5 sec, then ‘show’. Keep repeating for as many times as you want and it should flicker.