If you're talking about frame delay, regular practice has it. If not, I don't know what you speak of.
No, I mean like a training mode online where you can train with others online. My friend is teaching me how to Viola while I'm teaching him how to Ivy, but it's a pain since we always have to start a new battle, build up meter ourselves, ect.
That's why Player Match exists, if you want to train online you should go there, ranked match is supposed to be for trained people.
I think he means like practice mode only you can do it with a friend online, that's actually a good idea.