I dont have Fire Red anymore but I still have the wireless adapter thingy. Last week I was digging through a plastic storage tub to look for stuff and I noticed that I still have the wireless adapter thingy for the Pokemon Fire Red and Leaf green games.
Man that brought back memories of doing alot of trading back and forth
I think the communication speed was just fine when using the old wireless adapter.
Honestly though anyone who bought a "players choice" version later on it should have come with the wireless adapter. Im one of the first time buyers who got the first release of Fire Red which the wirelerss adapter was inside the game box to begin with anyway