Can somebody explain me why Nihilego is half-Rock-type?

>>29798730
>Rock
>Poison
>Glassy
>Makes the person it grows attached to become dependent on it
>Said person becomes a snarky bitch without their 'fix'
Anon it's meth

>>29798730
It's body is made of a glass-like substance.

File: crystal-meth.jpg (297KB, 1180x664px) Image search: [Google]

297KB, 1180x664px

Glass comes from sand.
Sand is tiny rocks.

Also pic related.

>>29798730
It's made of glass, wich is molten sand.

Nothing makes sense anymore.

>>29798744
>>29798747
>>29798748
Isn't sand Ground-type?

>>29798730

Its made of glass.

>>29798730

Made of glass

As for the Poison part

>One of several mysterious Ultra Beasts. People on the street report observing those infested by it suddenly becoming violent.

It's what turned Lusamine into such a psychopath

>>29798753
Or you shouldn't have skipped science class and just simply copied the other kids' notes/assignments.

>>29798730
Crystal (Rock) Jellyfish (Poison)

>>29798760
Sandstorm is a Rock-type move

>>29798760
This isn't sand. This is hardened sand.

>>29798769
Arguing that there's some kind of science behind this. Pleb.

>>29798786
And yet Sandygast is a ground type pokemon.