I have an idea for an episode. After underperforming at a Wonderbolts Reserve practice, Rainbow is tempted to take performance-enhancing drugs. Alternatively, Rainbow could catch a fellow Reserve using performance-enhancing drugs, and must decide whether or not to tell Spitfire, because she's worried about being called a snitch. They could have the drug be a vitamin, and say that it makes you stronger and faster. The temptation to use steroids and other performance-enhancing drugs is something young athletes WILL face, and I'd be interested to see if the show could tackle such an issue.
So kinda like the Flim and Flam brothers' Tonic stuff. From the episode in Season 5 where Applejack learned the value of Honesty. Spoiler earning her key
Doesn't seem likely. You have to consider the show's actual target audience, and realize that the 5-7 age group doesn't often feel pressured to be competitive.