Iirc, Shiny Rayquaza is a locked encounter, meaning it's impossible to get it.
The Stats, OT Handler Name and the ID also makes me think it's hacked even more.
So, imo, it's definitely hacked, 100%.
Coming from my experience from generating Pokemons (RESEARCH PURPUOSES, I'M NOT SAYING HACKING IS GOOD, NOR IT SHOULD BE USED IN COMPETITIVE ONLINE POKEMON, what I do say is that hacking for testing stuff is okay as long as you don't go online with it or throw Pokemon in wonder trade n' stuff, which happens pretty often from my latest expriences in it, because I got a Marshadow level 100 from wonder trade, TWICE) this is definitely a hacked one, and a pretty bad one at that, the guy that threw it in WT is playing a very risky game, should get banned soon when the next ban-wave hits.
My advice? Do NOT use it online as I said before, proper protocol should be releasing it and be clean, do not store it in PokeBank either, just trash it out and forget about it.