Legendary Pokemon were given to players as a reward for tournaments. (Entei for example) Do you want those banned too? Those players worked hard to receive those rewards. Taking advantage of the masses to jump on your bandwagon without giving them the full picture is also uneducated and you should also consider the fact that you haven't presented or acknowledged any counter arguments. To everyone who doesn't know already, this user is using a tactic known in literature and writing known as "fallacies". It is wise to always do your own research to ensure you do not fall into biased pitfalls. It should also be asked. why is this user no longer staff?
No by all means they should be able to keep their pokemon and use them. The IVs on those pokemon ARE random, not selected by the person who has it.
Also, I am no longer staff due to having to focus on my education, thanks for the concern though.