Personally I don't think its worth throwing away extra Colins for gold or rainbow crystals. As mentioned before she's better used as mini-Plat Armors. Or chase that last skill point. If you do that while using them to level Colin up you gain something even if the skill point doesn't drop.
If I had to choose I'd do Rainbow Crystals. Gold is easy to get while they are not. But a paltry 3 RC return when you need 1000 feels like a waste to me.





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