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Deals damage. In doubles and triples it deals typeless damage to the opponents next to the target equal to 1/16th of their maximum HP rounded down. This does not trigger abilities that are triggered by Fire-type attacks. The non-targeting damage is not blocked by Protect, Wide Guard, Detect, Endure, or the ability Wonder Guard. The non-targeting damage is blocked by the ability Magic Guard. The non-targeting damage is not associated with the user, so the user is not affected if an opponent that is KOed by the secondary damage uses Destiny Bond.
Flame Burst is outclassed in singles by Flamethrower. In doubles and triples it is useful for its ability to hit multiple targets.
Flamethrower is a more powerful alternative.
Fire Blast is a less accurate but more powerful alternative.
Lava Plume is a more powerful alternative with a higher change to burn.
Heat Wave is a more powerful alternative that hits both opponents in doubles.