My A R Codes Don't Work ;_;

[Milotic]

Ok i'm a noob and new to coding D8

I'm trying to make codes for my six ultimate pokemon and i tried expoting it and clicking the buttons i thought made sense but everytime i go into the code it's short and doesn't work whe i try to activate it instead of replacing the pokemon it just wipes them out and nothing happens can someone helps me?

[Shiny Sheimi]

Are you using PokéGen to make them?