What is the significance of different colours and number of rings for wormholes?

Question

I am curious as to whether there is some sort of code for colour and number of rings. Are some legendaries only behind different varieties? Do some wormholes have higher probability of shinies?

Comments

I know for a FACT that the higher the number of rings, the greater the chance of a legendary. Yes, there is a code for the colors, I don't know at the top of my head.

Answer 1

The thing determining what Pokémon you get and where you go is the colour of the wormhole. There are five different colours, each with a different locale and thus different Pokémon that are available to you. Be sure to pick the right one when hunting for certain Pokémon. However, the Pokémon you do get is random, with some Pokémon being rarer than others, and you'd need to leave and come back to get another

White Wormholes - Ultra Beasts
Blue Wormholes - Waterfall
Red Wormholes - Cliffside
Green Wormholes - Field
Yellow Wormholes - Cave

Ultra Beasts you can get an infinite number of times, but Legendary Pokémon will only appear until they have been captured.

Sorce: https://www.serebii.net/ultrasunultramoon/ultrawormholes.shtml