Right now, it still needs more work. Try asking other peeps who main a character for more MU(Match-up) info for Devil Jin. I could provide some anti Yoshimitsu for you, but I'm gonna need to seek out a buddy of mine for this. Despite Devil Jin being a match-up no one cares about (due to no CAS ban), I still think info for a noob is always a good idea.
No one wants to keep losing due to lack of knowledge.
For now, I'll just tell you a typical Yoshimitsu online I fight. Note not all are the same, but this is just some stuff I've considered as what a Yoshi will do.
Dragonfly stance
DGF K and DGF B are the most common stance stuff. Both can be avoided if you're already knocked down. Just lie there, but look out for 3B if they're smart. DGF A imho isn't all that useful except when he's back turned. However, the best course of action is to knock him out of the stance. See a dragonfly? Swat it with a laser(the 8A+B one). Period.
Super Dragonfly stance
SDGF B and SDGF A are the most common. For SDGF B, just step back. If gutsy, Just guard it. You could sidestep it, but that's where SDGF A comes in. It will catch steppers. To avoid it, step back or block. Basically, step back from these SDGF. If a Yoshi flies toward you, just step back. If near a wall, be wary of SDGF A+K. That suicide will hurt. Best course of action is to not be near a wall. SDGF B+K(Basically this makes him come down on Flea stance). Not many Yoshi will use this. If they do come down with this stance, just swat the Flea with a laser. If he does the SDGF 2B+K one, step back because it guard breaks and it quake stuns.
Meditation stance
The MED B guard breaks. MED A is the typical low. MED K launches you. Just back step Yoshi once he does MED. The MED A+K is uncommon, but back step applies here too. Be wary that a Yoshi will use this one deviously. Every once in a blue moon is something to fear.
Other stuff to look out for
iMCF. Let's just say you don't want Yoshi to be close and doing this to you. It will CH, they will combo with it. Or worse, the measly combo will ring you out
214A. Every Yoshi does this. If you step, do a high attack in a string, grab, or do a slow move, this low will hurt.
Yoshi's CE. If a Yoshi has meter, it's obligatory that you tread carefully. The minute you least expect it, this will be whipped out
For now, this is all I know. I may have left out some stuff, but I'll leave it this for now.