Pokémon Essentials v19.1 is now out! It has many bugs fixes, including gifs now working again, various debug features now working as they should, and the Battle Frontier being back in action. For bonus points, the Battle Factory now finally works too. There's also a bit of lag-busting going on, with events no longer unnecessarily checking whether they're in tall grass several tiles per frame. There are some more changes too, such as taking away the player's ability to change the fonts (why would you ever want them to do that?) and giving them more text characters to choose from when they're naming something.
As always, the change log contains all the details about what v19.1 brings. This wiki cannot provide any download links.