It learns Sacred Sword at level 43.
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In Pokémon Black and Pokémon White, you will need to take Keldeo, Cobalion, Terrakion and Virizion with you to the Moor of Icirus. Once you're there, a cutscene will happen that will involve the teaching of Secret Sword to Keldeo.
go to TokyoU and enter the contest in the training center then beat level 1 and 2 then beat level three and then you will get the sword
well there are 2 the legendary magma sword wich you could only get from quibbler contibler and the the reign bringer witch you get from swordhaven level 5 sword shop
You can get a rusty sword from pickpocketing h.a.m. members in their dungeon near lumby castle. It requires level 15 or 20 theiving.
If memory serves that would be the 105 job change Sword Master.