any new way to play multiplayer Online?

[tywald]

Well you can try using your public IP(i.e IP shown on sites like http://whatismyipaddress.com/ ) and give that your friends, don't forget to enable built-in ad hoc server in PPSSPP; or you can tell your friend to do that(somebody must be the host of the ad hoc server). In order for it to work everybody must port forward all the neccessary ports the game uses or put the device in DMZ in your router.

You can find out what ports you need to open if you check Listening Ports in Resource Monitor if you use Windows. For Monster Hunter games you must open the ports: 10000, 20001, 20002, 20003 and 20004 as UDP and TCP.