A battle method that should be considered is where everyone battles with the first form of their monsters and at level 1 even if they're max level. So say before you battle obviously you choose which monsters you wanna use but when the battle starts say two special effect let's say its called "First form effect" and "First level effect" (jut came up with a random effect name come up with better ones for the 2 special effects ) the effect is applied at the start of the battle and when that happens all monster return back to their first form level 1 and they only keep their relics and runes the same but all their stats revert back to what it would be if they were level 1. So basically everyone's battling with baby monsters basically and they either keep the moves they had or literally only battle with the default moves when they're monsters are level 1