Creatures who cannot evolve or are at their last evolution points still earn Terra Points. I suggest those Terra Points go to something as in: Get 10 Terra Points your Creature gains 1 level or something along those lines.
I hear a lot of people saying that they are mad at how weak there pet is, if you look by your pet icon it has a "stay" option if you do this and are strong enough to train yourself you can get your pet strong without having it to even get involved in a fight. Just make sure it is in a safe area away from monster who will attack on sight. + if this helped.
@ BOOMWTF The boss in the desert, have matt use a fully upgraded (or 4) ice weapons and use his best ice move, have nat use a mix of the healmore spell and ice shard, and lance upgrade whatever gun fully and the skill Unload fully and you will own that tank. Oh also most importantly watch for when the top of your screen says he is charging figure out what move it is and put on armour to resist it. If you dont have anything upgrade ur darn armour. Hope that helps.