The rarest Pokemon in Pokemon Go can vary depending on several factors, such as where you live, which specific Pokemon are rare for you, and how long certain Pokemon have been available. However, based on the search results, here are some of the rarest Pokemon in Pokemon Go:

• Azelf, Mesprit, and Uxie: These are the rarest Pokemon in Pokemon Go because they are region exclusive and only spawn in the wild in certain regions.

• Larvesta and Volcarona: These two Pokemon are currently some of the rarest in Pokemon Go because even though Larvesta can be obtained from 2km, 5km, and 10km eggs, it sits on the highest rarity tier.

• Archen: This Pokemon is considered one of the rarest in Pokemon Go.

• Goomy: This Pokemon is also considered one of the rarest in Pokemon Go.

• Kecleon: This Pokemon is another rare one in Pokemon Go.

• Melmetal: This Pokemon is rare even in its standard form because it was introduced during a limited-time event.

• Unown: This Pokemon is rare because there are 26 different forms of it, and it often appears only during special events.

• Sandile, Krokorok, and Krookodile: These Pokemon are rare because they are region exclusive and only spawn in certain regions.

• Sunglasses Squirtle: This Pokemon is rare because it was only available during a limited-time event.

• Legendary Galarian Birds: These Pokemon are rare because they are Legendary and only available during certain events.

Its important to note that this is not a complete list of every rare Pokemon in Pokemon Go, but it covers the majority of creatures that are currently difficult to find.