Yanma not evolve at a certain level, you must teach him the move Ancient Power. Then, once you level him up, he should evolve.
It will evolve at level 48
it will evolve at level 21
Pachirisu does not evolve :(
Arbok does not evolve
level them up
level 44
at level 20
Level 40.
Level 10
level 25
Level 30
level 32