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whoever said that in terms of male human and female pokemon breeding, vaporeon was the most compatible for humans was clearly just desperate to justify themselves.
first of all, they cite the fact that vaporeon is in the field egg group, a group composed of mammals. this completely ignores the fact that human-like pokemon have their own egg group, separate from the field group. humans are certainly human like, and would undoubtedly be a part of the human-like egg group.
next, they cite the size of the vaporeon (about 3ft) as being "large enough." if the goal is a perfectly compatable creature, "enough" won't cut it.
it is also noted that a vaporeon can handle roughness because of its access to... acid armor??? the description of acid armor makes it very clear that vaporeon is liquefying itself, making it impossible to interact with physically.
now, the real perfect "partner" pokemon is clearly cacturne
not only does it solve the problems listed above, but it also has access to water absorb. further more, cacturne is described in its pokedex entries as a persistence hunter. this would make it much more capable of endurance compared to vaporeon, which is likely ambush predator. it also has access to moves that could properly assist in the breeding process. endure, encore, body slam, helping hand...
cacturne is clearly the optimal choice for male human and female pokemon breeding.