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Giratina Vstar

I can never use my Giratina Vstar's ability. I have ten plus cards in the lost zone. I tried in "test" and in a casual match. What am I missing?
Answers
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Did you use a Sky/Forest/Earthen Seal Stone or any other Pokémon VStar Power before trying to use the Giratina Vstar Power?
The Seal Stones count as a VStar Power so if you used it you can't use any other VStar Power after.
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I don't have any trainers that give Vstar powers and I didn't use any Vstar power! I went to test it in "test" and still couldn't use it. I have over 10 total cards in the lost zone!
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And you have one Grass and one Psychic energy attached?
What really happens? The attack is disabled or you can click it but doesn't work?
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Is your Giratina in the active? Star requiem is an attack, not an ability.
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