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Ezekiel 28:14 Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire.
The king of Tyre; (the answer appears in verse 12).
12 Son of man, take up a lamentation upon the king of Tyrus, and say unto him...
The king of Tyre is addressed as the representative of the city of Tyre and the prophecy concerns the future demise of Tyre not just the king himself.
The language is poetic symbolism and refers back to the partnership of Tyre with Israel in the time of Solomon in the building of the Temple of God at Jerusalem.
Men of Tyre supplied the timber and squared the stones of the Temple erected on the mountain of God (Zion) – 1Kings5.
I hope this helps.