Standard/regional:

swinub -> piloswine -> mamoswine: spheal -> sealeo -> walrein: piplup -> prinplup -> empoleon: vanillite -> vanillish -> vanilluxe: snorunt -> glalie -> froslass: snover (regional) -> abomasnow (regional): frigibax -> arctibax -> baxcalibur:

Add picks:

Uncommon: alolan_sandshrew (regional) -> alolan_sandslash (regional): seel -> dewgong: shellder -> cloyster: smoochum -> jynx:

Rare: alolan_vulpix (regional) -> alolan_ninetales (regional): deerling_winter -> sawsbuck_winter: crabrawler -> crabominable: snom -> frosmoth:

Epic: sneasel -> weavile: cubchoo -> beartic: amaura -> aurorus:

Uniques:

lapras:

delibird:

castform_hail:

rotom_frost:

cryogonal:

arctozolt:

arctovish:

iron_bundle:

Legendaries:

articuno:

regice:

tornadus:

kyurem: