This image is being publicly released from the Regional Dex Project after a certain date of embargo. This is one of my contributions to this pack.

The pack contains over 120 Pokémon from 19 artists, and the full thing is readily available — alongside the previous iteration covering the Sinnoh region — for just $1 each on their Gumroad.
https://regdexproject.gumroad.com
You can also follow their Twitter here for any future updates.
https://twitter.com/RegDexProject