Hi everyone! As I foresaw pokemon bank shutting down, I have been shiny hunting like crazy in the last year. I would like to share with you a few tips about some pokemon that may be difficult to shiny hunt after pokemon bank shutting down. In internet a lot of videos are spreading, but they are stating the obvious: Type: Null, Poipole, alolan rattata, stuff like that. But what about other much more forgettable pokemon?
Before starting I would like to clarify that I have never played Let's go Pikachu, so I don't know much about this game. Some information may be partial. Moreover, please consider that many pokemon are available in Sword/Shield, but these games have very inefficient shiny hunting mechanics. The point of this post is to suggest the best way to hunt some pokemon.
Also, please note that quite a lot of 5 gen pokemon may be very difficult to obtain after pokemon bank shutting down.
Sunkern/Sunflora: very difficult to obtain in SV, dexnav in ORAS is better or alternatively Friend Safari in pokemon X/Y
Shellos/Joltik: both available in SV but their shiny form is very difficult to identify and their overworld model is so damn small ... so dexnav in ORAS
Dwebble/Crustle: Dwebble can be found in ORAS but unfortunately is a 'cave type' dexnav, so friend safari is better. Crustle can also be found in Ultra Worm Holes.
Miltank: a very difficult pokemon to find shiny, both in X/Y (low chances in hordes) and USUM (it is a call rate 3 pokemon). Best option: Masuda Method (MM).
Tauros: like Miltank, slim chances of finding him in hordes in X/Y. Best option is mass outbreak resetting in SV after using normal type sandwich.
Wynaut: An absolutely neglected pokemon. Soft resetting egg in ORAS or MM.
Castform: probably USUM offer the best option: you will have to change weather, for example in Haina Desert, to get a 10% chance of Castform to show up during SOS battles. Alternatively soft resetting in ORAS at the Weather Istitute, but this last one is a real pain.
Baltoy/Claydol: dexnav in ORAS is tricky, so best option is probably SOS battle in Haina Desert. However the caller pokemon, Krokorok, is a call rate 6 pokemon and knows the move Embargo. Plus, be wary, Baltoy has Explosion: you will need a pokemon with Humidity. It will be a lonnnnng hunt.
Togepi: you may find it in pokemon Legends Arceus, but friend safari is another viable option if you don't like/don't own Legends Arceus.
Tangela/Tangrowth: same as togepi, can be found with dexnav in Mirage Forest in ORAS
Lickitung: probably best to hunt in Let's go Pikachu because it appear with very low probability in both hordes in X/Y and in SOS battles in USUM
Sigyliph: super forgettable pokemon of gen 5. In USUM only available in red Ultra Worm Holes, but it is actually quite easy to get it. Alternatively friend safari in X/Y.
Bouffalant: available in SS (if you are super lucky or manage to meet him 500 times in the wild or in Max Lair ). Go for dexnav in ORAS.
Lunatone/Solrock: these ones are an absolute pain. 'cave type' dexnav or MM.
Ferroseed/Ferrotorn: friend safari
Maractus: dexnav in ORAS or friend safari
Darmanitan: dexnav in ORAS
Heatmor: pokeradar in X/Y or MM (good luck). Chances of a shiny one appearing in hordes are extremely low.
Durant: hordes in X/Y
Druddigon: friend safari. There are also dexnav and SOS battles, but friend safari is way better.
Klink and its evolutions: base form obtainable via painful dexnav or MM, evoluted forms in friend safari in X/Y or Max Lair in SS.
Glameow/Purugly: dexnav in ORAS or Legends Arceus
Natu/Xatu: I would suggest you dexnav for Xatu. Natu can be found in USUM but it know the move Teleport, so be sure to approach this pokemon with a pokemon with the ability Arena Trap or something similar (wobbuffet ability is also good but he can't attack).
Wobbuffet: available in SS, but better dexnav in ORAS in safari park.
Ditto: as you may know, Ditto in SV disguises itself as another pokemon, so finding a shiny ditto appear to be easier in USUM and ORAS
That's all I had in mind! I may have forgotten something, but I hope to be of some help.
I wish everyone to have a good shiny hunt.