Alolan raichu, 2Ds internet, and back to UsUm?

Question

So this is three questions in one, so each question will be kind of short. If anyone knows any answers to any of the questions, they would all be helpful.

Question 1: I need to know if you can get an alolan raichu In any of the switch games with any random Pikachu. I have a shiny one from go, and I want to get an alolan raichu from it. I’m also wondering if you Can get a shiny alolan raichu By trading the one person in let’s go A shiny raichu.

Question 2: Now, this next question is kind of random, but I want to know if there’s any way to connect a 2Ds to the internet nowadays. I’m assuming that there isn’t, but if there is, I’m all ears.

Question 3: Now, this question isn’t possible if you need internet to connect Home and Bank, but I need to know if Pokémon available when bank came out can be transferred there from Home. Again, random, but I need answers.

Comments

In future, you should ask different questions in separate threads (mentioned in rule 0.5).

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Alolan Raichu is available with the following methods:
LGPE: Trade Kantonian Raichu in Saffron City (Alolan Form)
SWSH Expansion: Max Lair (Dynamax Adventure) (Kantonian/Alolan Forms)
Reward for finding at least 40 Alolan Diglett (Alolan Form)
Events in Sc/Vi (now passed)

The alolan trades in LGPE are not shiny locked. However, you will not get a shiny Alolan Raichu from trading them a shiny Raichu. It's random 1/4096 odds.

You cannot evolve Pikachu to get Alola Raichu in any games except for SMUSUM.
https://bulbapedia.bulbagarden.net/wiki/Raichu_(Pok%C3%A9mon)

Wifi will always work on 2/3ds as long as your wifi card works. They never discontinued wifi, just online connectivity and services.

Bank pokemon can still be sent to home, but pokemon from home can't be sent to bank. Yes, you need wifi.
https://pokemondb.net/pokebase/233293/what-games-can-i-trade-transfer-my-pokemon-to?show=233293#q233293

to answer your ultimate question, you cannot send your shiny pikachu to USUM to evolve it there.

if you don't specify otherwise, I'm going to edit your question to being "Can I send my Pikachu back to any game to evolve it into Alolan Raichu" since to me that seems to be what you're trying to figure out.