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Yep. It will try to evolve every five levels from 30 onwards, e.g. 35, 40, 45, etc. If you change what stat is highest then it will change forms again.

At level 100 it will evolve again into the...

Those levels are the reason it didn't evolve. None of those stats are the highest, so it can't pick a form. If striking was higher than any other stat it would be a striking mag, if range was...