Not in vanilla Cobblemon. Needs the AllTheMons datapack (or my Cobblemon Survival Guide modpack, which includes it). Same in AllTheMons x Mega Showdown.
Best Spawn Conditions
AllTheMons datapack
Rarity
ultra-rare
Biomes
Plains
Weight
1.50
Level range
50 – 70
Time
any
Weather
any
Context
grounded
EV yield
3 Attack
Best Poke Snack Berry(s)
Kelpsy
Can see sky
true
Presets
Natural
Properties
Has at least 3 perfect IVs
Spawn multipliers
3.5x if it is raining