From Bulbapedia, the community-driven Pokémon encyclopedia.

Lanette (Japanese: マユミ Mayumi) is the younger sister of Bridgette, and, like her sister, is a computer technician. She lives in a house on Route 114 near Fallarbor Town. She upgraded Bill's Pokémon storage system, giving it a user friendly graphical interface and the ability to store more Pokémon and change the wallpaper of the Boxes Pokémon are stored in.

Her house gets very cluttered while doing research. In return for keeping it a secret, she'll give the main character of Pokémon Ruby a Seedot Doll, and Pokémon Sapphire and Pokémon Emerald a Lotad Doll.

In the TCG

Lanette appears on the Lanette's Net Search card from the EX Sandstorm and EX Emerald expansions.

Trivia

Names

Language	Name	Origin
Japanese	マユミ (Mayumi)	檀 Mayumi, a species of spindle tree.
English, German, Italian	Lanette	A "LAN" is a small, self-contained computer network. It's also similar to net.
French	Annette	From net.
Spanish	Aredia	From red, network.
Korean	마유미 Mayumi	Same as Japanese name.
Chinese (Mandarin)	真弓 Zhēn Gōng	From 真弓 mayumi.