Evolution Chains
Below are all evolution chains confirmed or strongly inferred for Pokémon Winds and Waves. Chains are grouped by primary type. Pokémon shown in italics were not directly seen in trailers but are expected based on their evolution line.
Water
Water-Type Chains
Water Psychic
Slowpoke ~ ?
Slowbro ~ 
Slowking Galarian variants possible given game's creative direction.
Water Psychic
Slowpoke ~ Slowking Alternate evolution branch from Slowpoke.
Water
Krabby 
Kingler ~ Fans speculate Kingler may receive a new evolution in Gen 10.
Water Rock
Corsola No natural evolution in mainline games; may receive one in Gen 10.
Water Flying
Wingull 
Pelipper ~ Water
Wailmer 
Wailord Water
Finneon ~ 
Lumineon Water
Tympole 
Palpitoad ~ 
Seismitoad ~ Water Ghost
Frillish 
Jellicent ~ Water
?
Gecqua ?
??? ~ ?
??? ~ Grass
Grass-Type Chains
Grass Poison
Oddish 
Gloom 
Vileplume ~ Bellossom is an alternate branch evolution from Gloom.
Grass
Oddish Gloom 
Bellossom ~ Alternate branch from Gloom using a Sun Stone.
Grass
Tangela 
Tangrowth ~ Grass Flying
Tropius No evolution exists; community hopes Gen 10 may give Tropius one.
Grass
Carnivine No evolution in mainline games.
Grass
?
Browt ?
??? ~ ?
??? ~ Fire
Fire-Type Chains
Fire
Slugma 
Magcargo ~ Fire Bug
Sizzlipede 
Centiskorch ~ Fire
?
Pombon ?
??? ~ ?
??? ~ Electric
Electric-Type Chains
Electric
Pichu ~ 
Pikachu 
Raichu ~ Alolan Raichu variant also possible given tropical setting.
Electric
Tynamo 
Eelektrik ~ 
Eelektross ~ Ghost
Ghost-Type Chains
Ghost
Duskull 
Dusclops ~ 
Dusknoir ~ Ghost Ground
Sandygast 
Palossand ~ Bug
Bug-Type Chains
Bug Flying
Ledyba 
Ledian Bug
Nymble 
Lokix ~ Poison
Poison-Type Chains
Poison Water
Mareanie 
Toxapex ~ Normal
Normal-Type Chains
Normal Flying
Taillow 
Swellow ~