Weezing
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Matadogas (マタドガス, Matadogasu?) is formed when two Koffings fuse together after their gases mix, and as one inflates, the other will deflate. Both faces appear to be frowning, with the larger featuring two lower large fangs and two upper blunted teeth. On each, the skull has been changed to simpler oval, with the smaller lacking the crossbones.
Read more about this topic: Hakuryuu