This one's been sitting in the inbox for a little bit while some preparations were made for the post. Poképon, made by Silverweed91, is a Pokémon-styled battle simulator featuring various ponies and other characters from the FiM universe. The current early release is a little barebones and unstable, but battling and teambuilding over the internet are fully supported. The game takes inspiration from Pokémon Showdown in its presentation and layout, for an easy transition for anyone used to that interface.

 A download link is available on the game's site, and the source code is located at the game's GitHub repository. Since there's no official game server running, I've set one up on my VPS; to connect, set the IP to lyrawearspants.com and the port to its default. There may not be anyone ready to battle when you connect; in that case, simply wait around for someone to show up.