Here's a glitch for all pet classes that can make their pet an absolute beast!
First. Get as many statuses on the pet as possible (good ones! Dont let any bad ones on such as ofos neutral). Get Restoring Purified Water, HP Scroll, and MP scroll for max effect. As well as any huna/cleric/sorc buffs as possible (Not your toggles though!)
Then unsummon the pet. Turn one of your pet toggles on. Any one will do.
When you resummon your pet every status effect will be placed on it permanently unless you:
Unsummon it again
Log Out? (Not sure of this one)
It gets a status effect (Tell the clerics/hunas/sorcs/DMs not to buff your pet or water it)
It gets a negative status effect (Not sure of this one either)
There may be other methods of doing this and other ways of breaking it.
NOTE: This is a known exploit and using it may incur penalties such as Temporary Banishment to the Abyss. Use this at your own risk.
If you put water, buffs, scrolls, and shade damage on an evo3 pet you've basically got a monster that can pulverise dungeon mobs without being touched. Works like a charm and with that much HP regen they could come close to tanking mobs without taking damage.