Ultimate Marvel vs. Capcom 3 had a native PlayStation Vita release, which is much easier for many phones to emulate than the PC version.
If you have a Snapdragon 845 or newer (Pixel 4, Galaxy S10+, OnePlus 8, etc.), this version runs than the PlayStation Vita version. The screen resolution is higher, loading screens are shorter, and you can play MVC3 on a lunch break without lugging a Switch.