>>25048312So I think this applies to almost every pokemon that
>seem to be in the higher tiers of intelligence, in other words not too wild>aren't said to be harmful to humans like hypno or drifloonNormally, they would try learn if the human is a trainer since that determines whether they can hurt or capture them. Since these pokemon have never seen a human, they'd probably think said human was just some kind of weird pokemon and would react accordingly, on this I have no good guess as to how gardevoir react to other pokemon in general, but if the human's situation becomes apparent they might just adopt them into their group.
Now if gardevoir weren't psychic it would just be left at that, but through their powers they can learn of humans, their differences, and maybe a way for the human to get home if they're familiar with the area they were at prior to washing up on the island. It would happen eventually, because certain things wouldn't add up. Like if the human is an adult and has no useful moves to defend themselves with, or can't understand pokespeak. What they do with all that new information is up in the
air. They might come to fear other humans, even if they are all fully evolved most wild pokemon don't have the conditioning and strategy that trained pokemon do. Most have probably never been in more than 4 real fights in their entire lives.