You cannot play online via emulation reliably. This is strictly for single-player arcade or versus mode.
Uses a 6-button Street Fighter control scheme, adapted to allow Tekken characters to perform their signature strings and juggle combos. Key Features of the PS Vita Version Street Fighter X Tekken Psvita Rom
Players can map commands to touch zones on the front and back panels for quick combos. It also features "Near" functionality for sharing customization data with nearby players. YouTube·Marc The Geek You cannot play online via emulation reliably
Technically, the community uses "ROM" as a catch-all, but savvy users look for “SFxT VPK” or “PS Vita game dump.” Street Fighter X Tekken Psvita Rom