Emily

Emily is a character of the day from Ep 102 She had an ongoing rivalry with Ralph, as both of them always competed with each other to see who had the best Pokémon. Somehow, they always ended up getting the same Pokémon, until Emily obtained a Nidoran♀ which she named Mary, and Ralph obtained his own Nidoran♂, John. Although the two trainers couldn't stand each other, their Nidoran fell in love.

(Source: Bulbapedia)