Not enough information here, but yes cycling tank is necessary. Live animals (fish, corals, other inverts, people) live off nitrogen and waste nitrogen, in forms that end up as ammonia. The tank requires a healthy bacteria population to convert this ammonia to nitrite and then convert the nitrite to nitrate. This "cycle" usually takes about 30 days but there are ways to hasten it. The buildup of anaerobic bacteria to breakdown nitrate to nitrogen takes much longer.
Im not sure with what you mean by "live" options. Back in the day when I first started the hobby, we would stock the tank with damsels to cycle it. The damsels will survive the ammonia poisoning only to kill each other in a fight for territory. This method is now frowned on for various reasons.
My preferred method is to use Seachem Stability; their our other suitable competitors. Cycling cultured live rock is another method and the two need not be exclusive. There are also methods to dose ammonia, use dead shrimp, feed the empty tank, etc. There is no need for "live animals" to cycle anymore.
As far as the friends tank, how are you determining it is or is not cycled? If its because he can't keep fish, there are many other variables at play, so you can't assume its the tank not cycled. He should add a source of a known amount of ammonia and then test nitrite and nitrate daily to determine of the tank is cycled.