ITV2 is on Sky channel 118.
It is on Sky channel 118 no matter what country you are in.
The only issue is where in Spain are you located and what size satellite dish you have installed.
In many areas of Spain, along the Mediterranean coast, you may well need a 2.4m Portuguese Famaval satellite dish to ensure reception of ITV2.
ITV2 is only available on one frequency and one frequency only.
Symbol Rate 22000
ITV2 is available free to air, with no sky viewing card.
There is also ITV2 HD available.
Symbol Rate 29500
And will be availble on your Sky channel list.
ITV2 HD requires a Sky HD subscription.
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