Legality of legacy Pokémon - Virtual console

[IvarovichRed]

Hello everyone, for the almost 30 years of me playing Pokémon I've dreamed of sending my Charizard from my original Pokémon Red to the newest titles, with Pokémon Champions release I'd love to bring him to that game, I've managed to get the save file on my computer and I can move it to a modded 3DS I have, I have some questions regarding this:

1. Is it safe to use in Pokémon Champions as is? - I plan on moving him through Poke transporter, bank, home
2. If I use PkHx to change the OT (as I misspelled my name originally) will it affect it in any way? make it illegal?
3. I did some testing with an Oddish and saw that it had "2016" as date caught, what date is this save file going to have? as it has never been officially supported I guess Nintendo would see a red flag if my Charizard has "1998" on it, is this correct? I'd love to have that year though

Thanks in advance for your help!