>>27153221 If we then use this size as an indicator of relative anthropomorphic health, we may come to the conclusion that Greninjas bear a uniform tendency towards Macrocephaly: a head far too large for its own body. This hereditary condition is usually accompanied by a generally defective development and growth of the osseous (skeletal) system, and it could possibly be a form of hydrocephaly (having water on the brain), which is plausible given Greninja's water typing.
This condition may also result from the inability of the dermal bones to fill their necessary space in the gaps of the chondrocranium at the proper period. In accordance with the general laws governing growth and development, having a deficiency in one place of an area is apt to result in an increase elsewhere in the same area.
