>>25273284Statistically, Mantine is identical to Skarmory, but with the physical and special stats switched, so giving it a baby form isn't that weird. Mantine's problems come from its typing and lack of recovery, not its stats. Plus it's a pretty big Pokemon, so having a smaller form makes sense.
The real mystery is why Chimecho, which is already shitty and small enough to be a baby Pokemon, got a pre-evolution instead of a much-needed evolution.