I was watching the Workshop thread like a hawk when I saw that the AdvancedLowerTier Hub was pending art. I love ADV LTs and wanted to go all out to contribute to a more permanent installation of the site.
I tried to make a list of pokemon to include that would have representation for every tier without including a single OU-ranked pokemon (Arcanine doing a lot of heavy lifting here lol)-
Ubers:

UUBL:

(

)
UU:

(and others below)
RU:

NU:

PU:

ZU:

SU:

SU has considerable overlap between the surrounding tiers
LC:

Doubles:

Alakazam is also on the VR, but like....
Orre:

play Orre!
1v1:

200:

JAA:

(

?)
Probably going to also include

Raikou, as it fits into a lot of the formats, but I'd be willing to guess that if an Arena Trap ban happens in OU then Raikou will rise, so I'm hesitant on formally including it on the idea that it might age into OU.
Unsure of how viable Zangoose is (not good in UUBL), but Frank Marley likes it in 200 and I like it in general so why not
The rough-in:
I wasn't sure what art style to settle on, but I experimented with a few brushes just to see what they do and I loved how one worked on the sky. Tried to do final shading based on that alone
Glalie as the moon almost gives Ocarina of Time, which was unintended but happy coincidence
Flatting in the other Pokemon. I included the sign as an inside joke, faded part in reference to the discussion for UUBL to become UU, yamna stealing ZU because of when it dropped to ZU and everybody hated it (except me heehee) and I'm gonna make the doubles sign singed to represent the ban on explosion
The middle of the sky seems very bare, so I'm thinking I'll move the text up there instead of at the bottom, making the image more rectangular which is better for the forum anyways. I'm also going to include inscribed in the ruins the more obscure formats like JAA and Orre
Shading halfway through.
Not sure if I'm happy with how any Pokemon other than onix and gloom turned out in the end. Maybe I should've left all of them a little flatter. Would've saved a lot of time.