Having outside support is a bit like having a spirit. You can't see them, but they lend you strength all the same. Send or receive 600 "Nice!" marks, and you'll feel strong too.
An alternate form of combat, with an alternate path to victory. Get 20 wins in Avatar Battles. But don't obsess over the results. Let experience be your guide.
You've heard of combo trials, I presume? It's time you practice attack sequences. I want you to finish 45 of them. It will be difficult, but I've the utmost faith in you.