As the date is 2010 and in a Cherish and Japanese there is only one Celebi which matches the description.
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Ability: Natural Cure
Hold Item: Jaboca Berry
Any Nature. : (Which is Calm)
Date of Receiving : Which seems to be 10/7/2010
Apparently had a fateful encounter at Lv. 50
Ribbons : Classic Ribbon
It was also received on the 10th of September which is in the time duration of this event.
This event started on the 10 July 2010 and ended on the 30 September 2010
I assume that the Celebi itself was legitimately obtained via the Event but Ice Beam was hacked on as it is not possible for Celebi to learn Ice Beam.
All the other moves can be legitimately learned though
But one thing is the Description. It should Say something along the lines of 'movie'. But since it isn't it may be hacked. But like I said I before I think that the Celebi itself was legitimately but it was modified.