Congratulations on finishing Final Fantasy VIII! The ending really is an experience. That time compression sequence is so unsettling.
Don't quote me on this, but I think what I've heard is that Ultimecia manifested Griever from Squall's imagination. She basically draws Griever from Squall's mind. The English text when you scan Griever is 'In Squall's mind, the strongest GF. Through Ultimecia's power, continues fighting without vanishing', which is a little unclear but would fit that interpretation.
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Don't quote me on this, but I think what I've heard is that Ultimecia manifested Griever from Squall's imagination. She basically draws Griever from Squall's mind. The English text when you scan Griever is 'In Squall's mind, the strongest GF. Through Ultimecia's power, continues fighting without vanishing', which is a little unclear but would fit that interpretation.
I'm so glad your kids got invested in this game!