I like watching for the simple things against Yosuke. A simple checklist:
1) He has meter? Watch out for wake-up Garudyne.
2) Blocked Dash Spring? Upback and throw if he does moonsault (an inexperienced Yosuke will do this), otherwise look out for either Kunais or teleport mix-ups.
3) Fullscreen? He can Dash Spring through your projectiles if he predicts correctly.
4) And most of all... check if they mash R-Action. "COME GET ME... YIKES"