Two years ago me and my son played through Pokémon Red and Blue. I wanted a full Pokedex and I gave alot of my shit to my son that I didn't use. I first did a speedrun to get Eevee, so we got all the evolutions of it.

Now I finally found a cheap copy of Silver (Gold I had already picked up). So is there anything like needing 3 Eevees in these games that I should know about before starting? Note that we still have our Red and Blue saves.