Anybody knows a good way of maxing stone wall and terra?

Try bursting.

Just join the team for burst/goddess training.
And train: tree bind [enemy] - blockage [enemy] - stone wall [pet] - terrafication [enemy]

Then stone wall and terrafication will leveled up very fast and also good exp for yourself. ^_^
When they are maxed, then use the orders:
Terrafication [enemy] - Tree bind [enemy] - Shield Defense [pet] - Blockage [enemy], according the goddess training guide.

or just use them lol.

after you stone walled your pet, atk to mob with your pet.

and same for terra. terra will level up in no time

What level are you anyways?

Just finish testing, heh .... sleep from lv1 0% go to max after casting it and the team deal 11k+ dmg(bursting/godness training)