>>15780030She's Green outside of Japan, and it's not hard to figure out that "Leaf"'s official name is Green too.
"Kris"/"Crys"/"Chris" is obviously officially named Marina, as the anime special is inspired by Pokémon Crystal. This also leads to the conclusion that "Gold" (ゴールド, Gold), the Generation II Ethan, is officially named Jimmy (ケンタ, Kenta).
The only character we're left with no known official name is "Silver" (シルバー, Silver).