I received this Virizion through a surprise trade:
- When it arrived it had the Pokérus virus.
- It's a shiny.
I thought those were two very rare combos to have.
Is this a hacked Virizion?
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It doesn't necessarily have to be a hacked one. The chances of getting a shiny legendary are not high, but you can add Pokerus very easily after that, by letting the virus spread itself:
As long as the Pokémon is infected with the Pokérus, it can spread the virus to other Pokémon in the player's party
Because you obtained it through a surprise trade, it hasn't got any illegal moves or stats, and there is no way to know for sure if it was hacked or not. You could check out this question to get an idea how to check if it's hacked or not.
The fact that it is caught in a Master Ball, would actually speak against it being hacked. Most Pokemon of the fifth generation can actually be caught shiny. Including Virizion.
Pokerus spreads fairly quickly as well. You just need to have the pokemon you want to infect be next to an already infected pokemon in your team for one or two battles.
You can never be sure about Pokemons being hacked or not while surprise trading, but if the pokemon does not arrive in an unusual ball, or has perfect IV's while also being shiny and/or legendary you can usually assume that it is caught legit.
In your case, if you got the IV Checker and it does not show the IV's to be the best in every category, I would presume it to not being hacked.