[Fixed] Bonus experience for some of my pokemon?

[Randoms2 0]

I'm not really sure why, and I never really complained about it (lol), but for whatever reason, two of my pokemon, Arcanine (from the police event), and my Camprupt (from the level 15 rain event), both receive about 1.5 bonus experience for every battle. The only thing that was different between these two pokemon from the rest of my pokemon were the fact that their names were first "z" or "x", and then renamed through the name rater to more suitable names. Reason was because I had a personal theory that nicknamed event pokemon were more likely to be shinies, and I got tired of punching in their full nicknames for every reset. After noticing this, I tried renaming one of my original pokemon to "z", then renaming it back to it's previous nickname, but no one else has received bonus exp.

Anyone know why this might be? Also, this game was a new game started from the community release of e15

Edit: Forgot to include my theory. I think that there is a hidden feature in e15 where trainers get bonus exp for a random element, randomly chosen at the start of the game, in which for my case, all my fire pokemon receive 1.5 exp. Haven't tested it out with another fire pokemon yet but it's just a theory

[Imperial 19]

Since E15 some event pokemons will get boosted xp as if they were traded. For instance Growlithe previously belonged to a police officer so you're not really it's original trainer. But in the community release some pokemons get boosted xp while they should not (like Numel I guess, or my new Fennekin). This was corrected in the public release

[ShadowStar 34]

Yeah some pokes were boosted without being traded.