How can I transfer a mons from gen 5 to my switch

[Sea_Pupper]

I have a lot of mons in my copy of Black2 that is a collection of all my childhood mons of years of playing all the ds mainline games that I really want to transfer to the switch. I do not have a modded 3ds, but I have a friend who does have one that is whiling to help out. We cannot use Bank to home transfer because theirs is a Japanese 3ds and we are not able to do everything to make it compatible to transfer to Home. I was thinking of using PKSM or PKHeX to transfer this mons but I'm not too sure how to do it, everything for PKSM that I've seen only is to transvers to USUM which makes sense since PKSM only goes till gen 7. I have not been able to find anything for PKHeX to transfer from 3ds to switch. I am able to use a modded switch to use PKHeX on my pc to transfer it into the switch then trade it to my main switch the issue comes from the 3ds. 

Thank you in advance any help is much appreciated.

[Kaphotics]

The only way to transfer from 3DS to Switch and beyond is to use HOME.

Transfer everything to Gen7, either legitimately or by save editors like PKHeX, then use HOME to transfer into the Switch era, and trade manually.

If you are unable to use HOME from the 3DS, then you are unable to bring things forward in a HOME-compatible future-proof way. Injecting manually to a hacked Switch will lack a tracker, and the Pokemon will be unable to be moved into HOME and other games.

[Sea_Pupper]

is there no way to use the modded 3ds to be able to read the game files while it's connected to a pc and copy over the files to PKHeX? 

Also, I was told that since the 3ds is a Japanese 3ds then we can't use it with bank to transfer to home or is this not true. I was told it's because the 3ds region is not the same as my American switch which is locked to the US.

I have tried looking up everything I can but cannot find good answers anywhere, so I figured here is the best place to be asking. I am very new and unaware to all of this so sorry if I ask a lot of dumb questions.

Thank you and sorry again.

[Shady Guy Jose]

The modded 3DS would enable you to read the save file and edit it with PKHeX, yeah. But it would be useless without a way of getting the Pokémon files themselves into Pokémon HOME. That said, if the Japanese 3DS has Bank installed, you just need to get those Pokémon into a Japanese 3DS game (and PKHeX can be used for that) and then send them up from Bank to HOME.