Game Help: SOS Chain Shiny Hunting in Sun and Moon

Recently I've started to play 'Pokemon: Moon' again and after hearing and reading so much about the popular shiny hunting, I want to try it out myself and catch a shiny Cleffa and a shiny Happiny. I've read many guides and watched videos on Youtube by now, for short I know I need an adrenaline orb to make the wild pokemon nervous for it to call for help and a strong pokemon, preferably with the ability pressure etc. But my question is, if it is absolutely necessary to own the shiny charm?

Nope, you can SOS chain fine without one.

colours said:

Nope, you can SOS chain fine without one.

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Okay, thank you. But I suppose it takes much longer than with a shiny charm.