Well I'm pretty comfident it is just from some japanese heartgold player and that it isnt hacked, so if you say nothing there indicates it's hacked then I'm going to go out on a lim here and assume it isnt.I already responded to your post. If you can't provide any more information you can't get a better answer. If you're really worried about it you should have it hack checked.
There isn't a reason to believe based on the information you provided that the Ho'oh is hacked. However, I can't say it's legal based on the above.
One thing you could tell me is if it seems to have been trained those two levels and has some EVs. You could wipe the EVs and provide the stats to make sure they are in the legal limits.