Patronus

Patronus
Rarity	Legendary
Type	Flying
Base Stats
	+95,400
	x381,600
	x429,300
	x105,000
Chances
1x	2.857e-06% (1 in 35,001,751 chance)
1.25x	3.57125e-06% (1 in 28,001,401 chance)
2x	5.714e-06% (1 in 17,500,876 chance)
2.5x	7.1425e-06% (1 in 14,000,701 chance)
4x	1.1428e-05% (1 in 8,750,438 chance)
5x	1.4285e-05% (1 in 7,000,351 chance)
8x	2.2856e-05% (1 in 4,375,219 chance)
10x	2.857e-05% (1 in 3,500,176 chance)
Rarity	Mythic
Type	Flying
Mythic Base Stats
	+143,100
	x572,400
	x643,950
	x157,500
Chances
1x	1.4285e-08% (1 in 7,000,350,018 chance)
1.25x	1.785625e-08% (1 in 5,600,280,015 chance)
2x	2.857e-08% (1 in 3,500,175,009 chance)
2.5x	3.57125e-08% (1 in 2,800,140,008 chance)
4x	5.714e-08% (1 in 1,750,087,505 chance)
5x	7.1425e-08% (1 in 1,400,070,004 chance)
8x	1.1428e-07% (1 in 875,043,753 chance)
10x	1.4285e-07% (1 in 700,035,002 chance)
Rarity	Legendary
Type	Flying
Shiny Base Stats
	+190,800
	x763,200
	x858,600
	x210,000
Chances
1x	2.857e-08% (1 in 3,500,175,009 chance)
1.25x	3.57125e-08% (1 in 2,800,140,008 chance)
2x	5.714e-08% (1 in 1,750,087,505 chance)
2.5x	7.1425e-08% (1 in 1,400,070,004 chance)
4x	1.1428e-07% (1 in 875,043,753 chance)
5x	1.4285e-07% (1 in 700,035,002 chance)
8x	2.2856e-07% (1 in 437,521,877 chance)
10x	2.857e-07% (1 in 350,017,501 chance)
Rarity	Mythic
Type	Flying
Shiny Mythic Base Stats
	+286,200
	x1,144,800
	x1,287,900
	x315,000
Chances
1x	1.4285e-10% (1 in 700,035,001,751 chance)
1.25x	1.785625e-10% (1 in 560,028,001,401 chance)
2x	2.857e-10% (1 in 350,017,500,876 chance)
2.5x	3.57125e-10% (1 in 280,014,000,701 chance)
4x	5.714e-10% (1 in 175,008,750,438 chance)
5x	7.1425e-10% (1 in 140,007,000,351 chance)
8x	1.1428e-09% (1 in 87,504,375,219 chance)
10x	1.4285e-09% (1 in 70,003,500,176 chance)

The Patronus is a secret Legendary pet in Bubble Gum Simulator. It could have been obtained by opening a Cosmic Egg. The chance of hatching it was 1 in 35 million (0.000002857%), or 1 in 17.5 million (0.000005714%) with the Lucky Chances gamepass.