>>23132640I'll tell you about my experience. I was stuck on that level for awhile, I used basically 3 combinations.
1. What you used.
2. What you used but with M-Ampharos (Hoped it's large attack power and better mega boost made up for it's lack of type advantage.)
3. Msableye, yvelta and the 2 other strongest dark types (One of them had a boost that gave extra damage to all dark types done in a combo, in other words every single game token)
But none really worked significantly better than the others, I used the 3rd arrangement the most and uncoincidentally finally caught Mewtwo with that arrangement.
But the one thing that really enabled me to beat him is right after I had 3 level ups on my dark-type team. Soon after that I started winning a lot more often and caught him while using a great ball after having 10 or so seconds left.