I already have sonic blade and I dont know whos ablities I should use and who I should give it too Im in symphony of sorcery sora and riku are level 31 critical and I have keeba lion cera terror and tatsu blaze im gonna switch cera terror with pegaslick or drill sye and when I get meteor from tatsu blaze im gonna switch it with anything you guys recemond

tyranto rex, ryu dragon, and fruitz cat are all very useful for abilities and commands.

This is a fully detailed FAQ on DE abilities and commands.

 

http://www.gamefaqs.com/3ds/997779-kingdom-hearts-3d-dream-drop-distance/faqs/64749

 

I agree with Frootz Cat, she is amazingly helpful, she can max out both your attack and magic hastes and also gets Sora Salvation. Aura Lion is nice as well, getting you attack and HP boosts, along with Faith. Tyranto Res is good for Metero Crash, Keeba Tiger gets you Dark Splicer, Ghostabockey gets you Dark Aura. I wouldn't worry about getting a Lord Kyroo or Skelterwild for Arcs Arcanum, you will find that in a treasure box.

i got ryu dragon

Dark Splicer is also in a treasure chest. Also, Skelterwild can get you EXP Walker, which gives you 1 EXP per step you take.