Let people build you a fair offer without the back-and-forth.
Post what you have and what you're looking for, put your own estimate of what each one is worth, and share the link. That's a tally. Whoever opens it picks what they can give and what they'd like back, and gets a block of text to send you.
Nothing is submitted from a share link and no account is needed to answer one. The trade itself still happens where it always did — this is only the part where you work out whether it's fair.
A fan-made tool, not affiliated with Nintendo, Game Freak or The Pokémon Company. It never connects to their systems. Pokémon and item sprites from PokéAPI.