After thinking about it for a couple days I think this may be the best decision to make instead of just banning Raging Bolt and rebanning Roaring Moon. It'll also make mons like Iron Valiant and Iron Moth much easier to deal with while still keeping them viable.
Valiant isnt even broken anyways and its one of few mons who are closer to the line if anything, and booster providdes invaluable emergency speed control for lots of teams which is very healthy. Also I ask again, why do people keep mentioning moth as if it is some uber hard to handle mon? It's good but it isn't remotely broken or close to it. There is so much counterplay.