Ice Path

Dratini Only spawns as the White Shiny Colouration. the global shiny rate does not alter its rate, Same applies to the Crystal Onix, the Crystal Onix can only spawn in the crystal mines and the Dratini can spawn everywhere except the Crystal mines.
Mini Bosses have a 1/500 spawn rate

Dex	Image	Pokemon	Type		XP Gain

Dex	Pokemon	Rate	Lvl Range	Note
42	Golbat	1/5	45-55
42	Golbat	1/5	45-55
75	Graveler	1/5	45-55
75	Graveler	1/5	45-55
79	Slowpoke	1/5	35-37
79	Slowpoke	1/5	35-37
80	Slowbro	1/50	45-55
80	Slowbro	1/50	45-55
95	Onix	1/100000	70	Always Shiny ★ 10
95	Onix	1/20	45-55
95	Onix	1/20	45-55
105	Marowak	1/20	45-55
105	Marowak	1/20	45-55
111	Rhyhorn	1/5	35-42
111	Rhyhorn	1/5	35-42
112	Rhydon	1/50	45-55
112	Rhydon	1/50	45-55
124	Jynx	1/100	45-55
124	Jynx	1/100	45-55
147	Dratini	1/500000	15-20	Always Shiny ★ 3
151	Mew	Mythical	???	Anywhere
215	Sneasel	1/100	45-55
215	Sneasel	1/100	45-55
221	Piloswine	1/20	45-55
221	Piloswine	1/20	45-55
232	Donphan	1/50	45-55
232	Donphan	1/50	45-55
245	Suicune	1/1	70	Boss Rank 7