Sup. If one owns a Switch (non-lite), they can extract their save to use with PKHeX, then inject the modified save back into the game.
Otherwise, regardless of what Switch you own, if you have Nintendo Subscription Online, could just trade with a sysbot via Discord.
Think of sysbots as "using someone else's hacked Switch". When you inject the mon via Discord, it gets sent to their save via live RAM editing, and the bot can then trade you the mon via linked trade. So basically all you gotta do is get the bot to trade you various pk8 files you've made.