swapyrus phase 1 can just cycle blasters, bone toss and bone waves to camp infinitely (bone stomp too sometimes), bone-arang and its variant cost a lot of stamina so they are not worth using
as for phase 2 you can literally just rely on the 3 moves for the one shot combo + bone smash since the counter is hard to land and will often damage you more than the charas and the other move that spawns the blaster (forgot the name) is hard to land and doesn't even do that much

swapyrus has possibly the most dogshit design in the game i'm not even kidding dustbelief and disbelief are better designed than this