LucarioPAX, can you elaborate on the Dtilt?
And as for skill level, we're all pretty good, like pre-professional or something. We do well in tournaments, but never win.
Sonic: Defense is pretty much what I'm doing as well as of right now, and my friend finds it annoying that he approaches me and has a 2/3rds chance of getting aura in his face instead, but he's good at the aerial combos, so we're pretty even. I guess it comes down to using Down-B or Nair to throw him off?
Wolf: Well in a 1v1, I can't be an opportunist and fire the fully charged aura spheres. Also, he's good at reflecting. I always immediately shield after my spheres now and still get hit by my spheres as often as he does. >.> The acceleration of the sphere is what's killing me. Sometimes I hit him if I use them close, but there's also the risk that I won't be able to shield if he predicts the sphere. I have him paranoid, though--sometimes I get in free hits because he reflected a not-fired sphere.
I still have trouble though because once Wolf gets in close, his smashes chase me across the ground. If I go air, Wolf's front air can get me (about 50% of the time, sometimes he gets a foot to the face instead). So mainly I'm having trouble getting away so I can hit him as he comes in again, because Lucario's tilts are even no match for Wolf's side smash and side tilt. If I predict a smash, though, I can pre-emptively grab. Grabbing Wolf out of a smash feels REALLY good.

But still, can't escape. I try to Dtilt but i'm always facing the wrong direction, Utilt is out of range, Stilt only hits half the time--his smash is still faster--and it has enough lag after that he can smash me if I miss it.
Olimar: Mainly he knocks me around with Fair and keeps me away with Side-B and side smash. Utilt can sometimes keep away the pikmin, and it gets them off before they do more than 1% (3% white). Still the matter of approach is difficult, though. perhaps a short hop in with a down-b?