From Pixelmon Generations

There are several sidemods that supplement Pixelmon, each adding additional features that are not in the mod by default. All of these mods are optional and it is possible to selectively choose which sidemods to install, or to not install any of them, some can be used on client or only servers.

PixelmonExtras PixelmonEcoBridge HyperModBanner
PixelAnnouncer TrainerCommands WonderTrade
PokedexRewards AnotherGymPlugin PixelUpgrade