Limitless Pixelmon runs a mixed-auth mode setup that supports offline mode (cracked) players. This system requires that you first be whitelisted as a cracked/offline-mode player to be able to join.
The first thing you need to do is join our discord, then navigate to the #support channel. Then copy and paste this support request template (replacing your username) and send it as a message:
Username: <put your username here>
Request: Cracked player whitelist
Note: Whatever username you choose should be unique; it will be case-sensitive and cannot be changed unless you want to migrate to an official paid account.
After being whitelisted by a staff member, you can then join the server. You'll then be prompted to use /register to create a password for account protection. You'll then need to use /login every time you join the server. This system prevents other players from trying to join with the same username as you to steal your items and pokemon; the password should not be shared.
Normal players who own a valid Microsoft account with Minecraft purchased can connect normally like any other server and do not have to use /login as we use Mojang's normal authentication unless the username joining is marked as a cracked/offline-mode player.