I was wanting to make some minigames and I want certain plugins to affect certain worlds PS I am using multiworlds
No, the plugin has to explicitly support that. You can however create multiple instances of PocketMine and use the transfer feature to transfer players around.
What the fuck is a multiport plugin? Your lobby would always be on 19121, the games can use whatever port, it doesn't matter, the player never has to manually enter it, they are transferred from the lobby server.
its this plugin https://poggit.pmmp.io/p/multiport. and true it probs gonna be used for a lobby server and other servers.
i dont know i was trying to have a two servers on one computer with port 19132 ,but that doesn't look like it will work
If you computer has multiple IP addresses you can use a server on 19132 on each one of them, you just need to set the ip manually in the PocketMine configuration file.