If you are meaning on how to heal your Pixelmon without the use of a Pokemon Center, you can use the command /pokeheal in the chat box to fully heal your team. Note that, you cannot use this command in a battle.
Chat with our AI personalities
It is in Viridian City, behind the Poke Center.
You can trade Pokemon with friends in the Pokemon centre,but you need a pal pad first
verillon city in the house next to the poke center
use a ultra/great ball
Talk to a woman in Eterna city Poke center and she'll give you it.