Do you think that's their skin?

I like to think it's not, and that it's made from forest materials. I think they share it with Throh that the belts are vines.

But what about Machoke's panties?

Same. Idk where the belt comes in, but I leave Poke-clothing in my suspended belief section.

2 of my favorite party pokemons n_n
It is really awesome

Why, thank you. UwU)/`

What's your typical party?

My tipical party is mostly:
Machoke (Machamp) n_n
Crobat
gengar
swampert
gyarados
dusclops

And the rest varies in the versions I play. I always have a machoke and crobat.
I mostly have these:
Throh
Sawk
blastoise
gengar
poliwrath
tyranitar
aggron
Dusclops (dusknoir)
Metagross
groudon
rayquaza
Garchomp
swampert
emboar
throh
sawk
cofagrigus
golurk
Nidoking
muk

how about you?

Chandelure
Defiant Braviary
a Fighting-type (Sawk or Conkeldurr, typically)
Serperior
Then two other Pokemon to round out my team, depending on what I'm doing.

I don't have a list, I just level up my Pokemon when I want to have that Pokemon on my team. o3o