Rainbows bring good luck. Like the pot of gold at the end of the rainbow. So there should be something special in the game when rainbow appears. What would you like to happen in the game during rainbow weather?
first Pokemon that you encounter and catch becomes lucky
higher chances for getting lucky Pokemon when trading
you can encounter a special Pokemon carrying a gift and when you catch it you get rewards
you can get a special gift that gives you rewards from Poke Stops or Gyms
higher chances of encountering shiny Pokemon
you get double candy/stardust/xp for every Pokemon you catch
But you can choose what to catch. There should be an icon indicating rainbow and the screen should appear saying during rainbow weather you can… Then you can choose which Pokemon you want to catch. Maybe you should be able to catch more than one, but only the first Pokemon is guaranteed to become lucky. For others it’s like with shiny Pokemon. So you must catch everything you see to get another lucky Pokemon.
I saw an article on GO Hub that rainbow weather is supposed to be connected with Alolan Pokemon, but that’s not the case right now. If you haven’t seen my poll or haven’t voted yet, feel free to check it out (up there ) and vote.
This topic is stuck with only 19 voters and it deserves much more. Please vote for options you think would be the best to happen during rainbow weather.