About to start fishing for a Mareanie on Route 9. Apparently

>>30111045
Additional slots are the chances each SOS can call from, so in the case of the one you posted: Mareanie can't appear as the initial pokemon, only after you're in a battle with a Corsola and it SOSs, and then it's a chance it'll call either another Corsola or a Mareanie.
Just be prepared for a long haul if you're looking for good nature / many perfect IVs / shiny, because the Mareanie WILL kill the Corsola immediately. And I'm not sure if the called Mareania will do an SOS itself.

>>30111097
Yeah anyone who actually tries to SOS chain this thing past the initial encounter is an idiot. If you want a shiny, Masuda it.

>>30111045
The chain only continues as long as the summoned pokemon is from the same family as the initial encounter, in this case if Mareanie kills Corsola the chain breaks

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>>30111179

Yeah I'm not going for a shiny/IVs or anything. Just trying to catch a Mareanie. So the initial Pokemon has to be a Corsola for a Mareanie to show up, correct? It can't be Magikarp, Wishiwashi, or Luvdisc?

>>30111179
If you only get one shot at it doesn't that make it even harder to get Mareanie's hidden ability?