Regarding ex, only the beginners play with only ex deck. There are many decks that can easily counteract the ex. There are several cards that do not suffer damage from pokemon basis (of which ex are part) or directly from pokemon ex (some of which also prevent the adverse effects). Ther...
If you truly want to host the client yourself, there is a repository for the Pokémon Showdown Client. It's not recommended for beginners, though. Setting up an Administrator account Once your server is up, you probably want to make yourself an Administrator (~) on it. config/usergroups.cs...