The blade of fiery light appears in random loot at level 15+.
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It is in the AC shop for 600 AC's.
You answered your question in your question. You find Grimer in the Fiery Path.
You can find a Fire Stone in the Fiery Path after you get the HM for Strength.
You can find Torkoal in Fiery Path or the Team Magma Hideout.
i asked my friend and he said you can get him in fiery path beside mout.chimney