Leveling I used:
In-game AP Helm
In-game shield+sword (Tut set)
Pop Vest (in-game event, vendable)
Pets from past events (Poppuri)
EVERYTHING I used to level would have continued to be viable, I just had some myshop lying around from past events. In the screenshot I have posted of my gear, ALL is IN-GAME EXCEPT:
Pet. Head Accessory. Weapon. All either gifts from friends or event points.
So yes, this guide assumes little/to no myshop as a possibility, JUST the presence of ELEMENTAL attribute.