Pixelmon / pokeballs can be thrown through wall's and glitched into battle with gym leaders or trainers. To do this. Go close to the wall & aim at the gym leader. Make sure you are close to the wall and that there is a wall there. The pokeball will go through, hitting the trainer & starting the battle.

Upon trying this in 8.3.3, I can confirm that this does sometimes happen. It depends on the angle of the throw, and how close you are to the blocks.

It is more common when throwing through transparent blocks, such as glass panes, stairs, etc, however from time to time, it does pass through a full block to start the battle.

Thank you for reporting this bug, I have marked the ticket as 'awaiting move to internal', so the devs can take a look.

Thanks,
-Bull

Thanks for the report. This has been moved to internal. Keep an eye out for any updates.