he keeps kickin my butt in the arena, and my three pets are almost at LVL 25 so i cant train them much more, idk how to beat hime, plz help

Luga has a good guide on how to defeat the arena bosses. https://www.sylestia.com/forums/?thread=26551

You'll really need to keep a lookout on the boss/your pets to see any effects they use, and study the battle log to figure out their patterns to defeat the arena bosses. One mistake could cause you to lose.

You can train your pets to level 25~ You'll just need to stop them from earning experience. :) You can do that by buying an item from the scale shop called "Philter of Unlearning" for 100 scales and then if you ever decide you want to level them, you can buy a "Philter of Learning" for the same price so they can earn experience again. This way you'll be at the highest level possible and can use the mystical equipment from the level 25 dungeon (it helps a lot!).