How to shiny hunt Grumpig.

The fastest known Grumpig shiny hunt is Walking in grass at Friend Safari Psychic in X — roughly 12.6 hours of active hunting. Every other game and route is ranked below.

Grumpig

25 shiny-huntable encounters

Best huntWalking in grass

Friend Safari Psychic

Friend Safari Slot 1

12.6 hr

estimated time to shiny

Encounter rate: 33%
Shiny odds: 1/1365
Encounters: 4,136
Level: 30

#212.6 hr

Friend Safari Psychic

Friend Safari Slot 1

Method: Walking in grass
Encounter rate: 33%
Shiny odds: 1/1365

#327.8 hr

Reversal Mountain Unknown Area 48

Black 2

Method: Dark grass
Encounter rate: 30%
Shiny odds: 1/2731

Shiny Charm from completing the National Dex.

#441.7 hr

Reversal Mountain Unknown Area 50

Black 2

Method: Walking in grass
Encounter rate: 20%
Shiny odds: 1/2731

Shiny Charm from completing the National Dex.

#	Game	Location	Method	Rate	Shiny odds	Encounters	Est. time
1	X	Friend Safari Psychic Friend Safari Slot 1	Walking in grassLv 30	33%	1/1365	4,136	12.6 hr
2	Y	Friend Safari Psychic Friend Safari Slot 1	Walking in grassLv 30	33%	1/1365	4,136	12.6 hr
3	Black 2	Reversal Mountain Unknown Area 48	Dark grassLv 35–37	30%	1/2731	9,103	27.8 hr
4	Black 2	Reversal Mountain Unknown Area 50	Walking in grassLv 35	20%	1/2731	13,655	41.7 hr
5	Black 2	Reversal Mountain Unknown Area 56	Walking in grassLv 35	20%	1/2731	13,655	41.7 hr
6	Scarlet	North Province Area One — Rocky Morning	Overworld spawnLv 32–51	4.35%	1/1365	31,379	2.9 days
7	Violet	North Province Area One — Rocky Morning	Overworld spawnLv 32–51	4.35%	1/1365	31,379	2.9 days
8	Black 2	Reversal Mountain Unknown Area 48	Walking in grassLv 33	10%	1/2731	27,310	3.5 days
9	Scarlet	North Province Area Two — Rocky Morning	Overworld spawnLv 32–51	3.23%	1/1365	42,260	3.9 days
10	Violet	North Province Area Two — Rocky Morning	Overworld spawnLv 32–51	3.23%	1/1365	42,260	3.9 days
11	Ultra Sun	Ultra Space Wilds Crag	Static encounter (soft reset)Lv 60	15%	1/1365	9,100	4.7 days
12	Ultra Moon	Ultra Space Wilds Crag	Static encounter (soft reset)Lv 60	15%	1/1365	9,100	4.7 days
13	Scarlet	North Province Area One — Mountain Morning	Overworld spawnLv 32–51	2.17%	1/1365	62,903	5.8 days
14	Violet	North Province Area One — Mountain Morning	Overworld spawnLv 32–51	2.17%	1/1365	62,903	5.8 days
15	Black 2	Reversal Mountain Unknown Area 49	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
16	Black 2	Reversal Mountain Unknown Area 51	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
17	Black 2	Reversal Mountain Unknown Area 52	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
18	Black 2	Reversal Mountain Unknown Area 53	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
19	Black 2	Reversal Mountain Unknown Area 54	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
20	Black 2	Reversal Mountain Unknown Area 55	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
21	Black 2	Reversal Mountain Unknown Area 57	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
22	Black 2	Reversal Mountain Unknown Area 58	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
23	Black 2	Reversal Mountain Unknown Area 59	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
24	Black 2	Reversal Mountain Unknown Area 60	Walking in grassLv 35	5%	1/2731	54,620	7.0 days
25	Mega Dimension	Lumiose City — 4 Star or Higher (Hyperspace)	Overworld spawnLv 32–34	0.8264%	1/1365	165,174	15.3 days