BlazBlue: Calamity Trigger

This trophy is titled "100 Trials" and it's for playing 100 ranked matches. While it's been suggested you can quit out, I'd strongly recommend this as you'd only be hurting your own progress towards the level 30 trophy. Personally, I played it safe and played each match through in order to rank up.

In order to get through matches quickly with a partner, it's suggested the player losing plays as Carl and the player winning plays as Haku-men. Carl Barrier Bursts (X, Square, Triangle and Circle at the same time) and then Haku-men uses his forward + C (O on default controls) while Carl moves in to the attack. This can make each round roughly 5-6 seconds at most. Rotate wins to help each other rank up and you'll be well on your way to level 30 as well.

The community is fairly dead so you can use quick searches if you'd like, however custom match searches allow you to see each other and pair up intentionally. Use this if you have trouble with finding randoms.