I have only really just started on updating the plugin to v19, it will also be updated to v20 once I am ... anyways, the features are as follows: Addition of the amie stats on all pokemon, even works ...

Fork this repo. Get a copy of Essentials v19 (a download link cannot be provided here). Clone your forked repo into the Essentials v19 folder, replacing the existing files with the ones from the repo.