Standard/regional:

magikarp -> gyarados: remoraid -> octillery: feebas -> milotic: wishiwashi -> wishiwashi_school: arrokuda: squirtle -> wartortle -> blastoise: poliwag -> poliwhirl -> poliwrath -> politoed: mudkip (regional) -> marshtomp (regional) -> swampert (regional): azurill -> marill -> azumarill: horsea -> seadra -> kingdra: piplup -> prinplup -> empoleon: totodile -> croconaw -> feraligatr: shellos_west_sea (regional) -> gastrodon_west_sea (regional): oshawott -> dewott -> samurott: sobble -> drizzile -> inteleon:

Add picks:

Uncommon: psyduck -> golduck: tentacool -> tentacruel: slowpoke -> slowbro -> slowking: shellder -> cloyster: krabby -> kingler: omanyte -> omastar: chinchou -> lanturn: dewpider -> araquanid: wiglett -> wugtrio:

Rare: goldeen -> seaking: staryu -> starmie: kabuto -> kabutops: carvanha -> sharpedo: finneon -> lumineon: binacle -> barbaracle: clauncher -> clawitzer:

Epic: wingull -> pelipper: wailmer -> wailord: barboach -> whiscash: clamperl -> huntail -> gorebyss: buizel -> floatzel: wimpod -> golisopod:

Hatches: froakie: popplio:

Uniques:

tauros_aqua_breed (regional):

qwilfish:

castform_rain:

relicanth:

luvdisc:

mantyke -> mantine:

rotom_wash:

basculin_red:

basculin_blue:

basculin_white -> basculegion_male -> basculegion_female:

pyukumuku:

bruxish:

tapu_fini (regional):

veluza:

iron_bundle:

Legendaries:

suicune:

kyogre:

palkia:

manaphy:

volcanion:

urshifu_rapid:

walking_wake (regional):