Anything towards Pokedex completion is highest priority followed by Event Outfits. Form differences and Shinies are lower priority unless otherwise mentioned.
Gen 2
Unown: B, F, J, K, P, Q, T, U, X, and Z
Gen 3
Tropius – Africa and surrounding areas
Huntail
Gorebyss
Relicanth – New Zealand and nearby islands
Shelgon
Salamence
Latias (I actually only have a shiny version)
Groudon
Rayquaza
Jirachi
Deoxys (all forms)
Gen 4-6
Ask as I’m missing so many– I’ll get this updated soon x-x
Event Pokemon needed
Regional Forms needed
Shiny Pokemon needed (mostly low priority with the exception of any with a *):
This is not up to date
Bulbasaur
Ivysaur
Venusaur
Charmander
Charmeleon
Charizard
Sunglasses Squirtle
Sunglasses Wartortle
Blastoise (Need one more shiny Squirtle :( )
Sunglasses Blastoise
Pikachu
Raichu
Shellder
Cloyster
Magmar
Vaporeon *
Jolteon
Flareon
Omanyte
Omastar
Kabuto
Kabutops
Aerodactyl
Articuno
Zapdos
Dratini *
Dragonair *
Dragonite
Pichu
Togepi *
Togetic *
Mareep *
Flaaffy *
Ampahros *
Espeon
Murkrow
Wobbuffet
Snubbull
Granbull
Houndour
Houndoom
Magby
Pineco
Forretress
Larvitar
Pupitar
Tyranitar
Lugia *
Ho-Oh
Poochyena
Mightyena
Makuhita
Hariyama
Sableye
Mawile
Aron
Lairon
Aggron
Meditite *
Medicham
Plusle
Minun
Roselia
Wailmer
Wailord
Swablu
Altaria
Shuppet
Banette
Duskull
Dusclops
Absol
Wynaut
Snorunt
Glalie
Luvdisc
Kyogre
pretty much every new shiny except for one Slakoth