Not in vanilla Cobblemon. Needs the AllTheMons datapack (or my Cobblemon Survival Guide modpack, which includes it). Spawns differ by version, both shown below.
AllTheMons
Spawn #1
AllTheMons only
Rarity
ultra-rare
Biomes
Overworld
Weight
2.50
Level range
1 – 10
Time
any
Weather
any
Context
grounded
EV yield
3 HP
Sky light
0 – 7
Best Poke Snack Berry(s)
Pomeg
Presets
Natural, Wild
Properties
Percent Cells: 1, Has at least 3 perfect IVs
Spawn multipliers
1.5x if the max Y level is -16
Conditions
Max Y level is 0
Spawn #2
AllTheMons only
Rarity
ultra-rare
Biomes
Overworld
Weight
1.50
Level range
10 – 50
Time
any
Weather
any
Context
grounded
EV yield
3 HP
Sky light
0 – 7
Best Poke Snack Berry(s)
Pomeg
Presets
Natural, Wild
Properties
Percent Cells: 10, Has at least 3 perfect IVs
Spawn multipliers
1.5x if the max Y level is -32
Conditions
Max Y level is -16
Spawn #3
AllTheMons only
Rarity
ultra-rare
Biomes
Overworld
Weight
0.50
Level range
50 – 80
Time
any
Weather
any
Context
grounded
EV yield
3 HP
Sky light
0 – 7
Best Poke Snack Berry(s)
Pomeg
Presets
Natural, Wild
Properties
Percent Cells: 50, Has at least 3 perfect IVs
Spawn multipliers
1.5x if the max Y level is -48
Conditions
Max Y level is -32
AllTheMons x Mega Showdown
Spawn #1
AllTheMons x Mega Showdown only
Rarity
ultra-rare
Biomes
Overworld
Weight
3.25
Level range
1 – 1
Time
any
Weather
any
Context
grounded
EV yield
3 HP
Sky light
0 – 7
Best Poke Snack Berry(s)
Pomeg
Presets
Natural
Properties
1%/Core
Spawn multipliers
+1.25x if the max Y level is -16; +1.25x if the max Y level is -24; +1.25x if the max Y level is -32; +1.25x if the max Y level is -40; +1.25x if the max Y level is -48; +1.25x if the max Y level is -56
Conditions
Max Y level is 0