Onix

[Caelus]

I always thought of it as a horn, since it uses it for digging and, in some cases, attacking (And that's the most logical reason, as far I can remember).

I don't what arbitrary potrusion is, nor do I want to know. And mohawk seems unlikely; Same can apply to Dorsal Fin.

 

[processr]

I think it's a compass point, much like the nose of a Nosepass. Looking at the Ruby/Sapphire 'Dex entry:

"Onix has a magnet in its brain. It acts as a compass so that this Pokémon does not lose direction while it is tunneling. As it grows older, its body becomes increasingly rounder and smoother."

So I'd say it's used for directional purposes, as per a compass.

(You can shut up now if you're going to point out that Gen III came out six years after Gen I. X3)

 

[andreality]

I think it's a head dorsal fin, only that!

 

[SapphireL]

I never thought too much about it... but I guess she has a horn.

Btw, doesn't 'dorsal' have to do with the back, rather than the head? :P lol I dunno.

 

[processr]

Btw, doesn't 'dorsal' have to do with the back, rather than the head? :P lol I dunno.

Try not to let it bother you on the Internet. There's far worse a person can do. xD

But yes, the correct term would probably be the "cephalic" fin, but as far as I know there isn't such a fin on any fish anyway.

 

[SUPACHEEZY]

I'm gonna go out on a limb 'n say it was an extra rock on its head and the Onix's mother sharpened it so it would look better =D

...

But really, I'd have to say a horn DX

 

[Young Stunna']

It is definitely a dorsal fin. Well it could be a horn but I always thought it was a fin.

 

[Halcyon]

The only option I understand is "A Horn"..... o.o

 

[Mateus_]

since the begining I think it's a horn Oo

 

[Sexycheese]

I think it is a "member" because onix is a poor excuse for a pokemon :)

 

[Thails]

Thanks for the help guys, I can now safely say that onix would sodomise pikachu with his "Horn"