Found out a few things on Smogon.
1st the stars are from doing the PokéStar Studios. Once your Pokémon because a movie star, it will pop up during battle.
Also the reason for all the shiny, IV, and Nature Pokémon and Legends could be due to RNG abuse. Apparently there is a program that you can use that can figure out by a timer system the RNG IVs and if a Pokémon will be shiny. The RNG abuse can be used on even Event and Dream World Pokémon to get perfect IVs and Nature.
This is not cheating however.

I was under the impression that any use of a 3rd party program, even a timer of some sort, would mean you are not taking the chances of normal game mechanics.
I am most likely the only one that feels that way though.
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