Evolve your mons and get a poison endgame. Take Blitz dragon towards the middle and that blue lion too. Chronozeros and mechaviathan can be there in the first line up otherwise they can get killed before they even get a turn. Unlock secret skills. You can also capture a noxdragon (legendary) from the cursed island. Evolve destructor to demolition. I used it in the early game till becoming the grand champion and a few battles after that. It’s useful.
What do you want to improve for? PvP, PvE?
U need a Galvbane