Implicating nidoran → pokémon_(species)
Link to implication

Reason:

nidoran♀ and nidoran♂ already implicate the species tag, but the base nidoran tag, which is often used for characters of ambiguous_gender, does not.

Nidoran♀ and Nidoran♂ are visually distinct 'species', so I'm not sure why the nidoran tag exists. There's no similar tag for Nidorino/Nidorina or Nidoqueen/Nidoking.

Nidoran♀: Blue, blunt horn, whiskers.
Nidoran♂: Purple, sharp horn, no whiskers, larger spikes.

nidoran -nidoran♂ -nidoran♀ doesn't find a lot of posts, and I think it might be possible to identify the untagged ones. Well, except maybe for posts such as post #923467, where the artist forgot to draw the horn.