>>19309064Red's name is thanks in part to the Mt. Silver battle and PWT.
Leaf is a name coined by Bulbapedo since it's her name in FRLG's dummy data, and her most consistently used name to avoid Blue/Green debates.
Ethan and Lyra's names are in HGSS, the one not chosen is your childhood friend.
Brendan and May are rival characters if not chosen.
Lucas and Dawn's names are in DPPT, the one not chosen becomes Rowan's assistant.
Hilbert and Hilda's names are in BW1 if approached in the Battle Subway's Multi Battle mode without a partner. Nate and Rosa have a similar case in BW2.
Calem and Serena are rival characters if not chosen.