Just tested. Pokemon never call for help when paralyzed. Never ever. Pic not related.
When I was chaining Corsolas, they still called for help after being paralyzed.
>>29920773
How do I get a Pokémon to call for help? I want a happiny as soon as possible (Before the second battle with Hau.)
>>29922699
Leave pokemon with 10-25% of its HP., and wait? the lower its HP, the better chanse it has to call for help
>>29920773
What about sleep?
>>29922699
>>29923604
Use an Adrenaline ball to make it more likely as well.
>>29922699
Happiny only appears if someone called her?
>>29923604
Didn't work for me, tried with two Pichus over several turns. Is it only possible after a certain point in the story?
>>29923817
At least in the patches where you can find Pichu