How do I trigger a Fever?

I noticed that when I pick a stage with my balloon, sometimes I get Fever, which allows me to go to areas with more stars.
Is there a way to trigger a Fever, or is it random? If it isn't random, how do I do it?
Best Answer
Unfortunately, Fever is a completely random event.
The method of getting this is completely random, but there is a way to see if you're likely to get one. When you return from a previous stage, if there is a rainbow around your balloon in the cutscene, then you have a chance of getting Fever in your next stage, so be sure to make sure you know what stage you're selecting first.
Source: Serebii
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Why do you get a fever when you're sick? - Christian Moro
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Answer 2
Fever is indeed random but the rainbows seem to be dependent on how high of a chain you make in the last stage you played, I've found that as long as I keep my chain over 50 at least once in the stage, I get 3 rainbows and a higher chance at super fever.
Answer 3
I too agree it is completely random but combos up to 20-30 and you get a really high chance of getting fever. However, you need to be patient, so try until you get it.
Answer 4
It is random, but if the island is on cool-down, just close the clam-shell, and the fever will still be there. I tried it, and I got a Kyogre.
Answer 5
It is somewhat random. If you see tons of white lines swirling around the base of the area, and if you can see a rainbow in the background, it is likely to go into fever mode
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