This is me battling against the second Team Rocket Executive, later to be known as Ariana, at the Team Rocket HQ in my Pokémon Crystal walkthrough. After finding out the password to the generator room and opening its door, Ariana will appear with a Rocket Grunt, trying to force you to battle 2-on-1. Thankfully, Lance then appears with his Dragonite, taking on the Rocket Grunt while you deal with Ariana. Ariana's team consists of Arbok, Gloom, and Murkrow. Psychic-type moves can be your best best against the first two, while Murkrow is vulnerable to Electric-, Ice-, or Rock-type moves. Fire- and Flying-type moves can also come in handy while dealing with Gloom. After defeating Ariana, Team Rocket will abandon the Headquarters, allowing you and Lance to stop the transmitter. After defeating, catching, or fleeing from the Electrode powering the generator, Lance will give you HM06 for Whirlpool, which can be used to clear natural whirlpools sometimes blocking your path outside of battle. PS. Sorry for the sound going off-sync. PPS. Please comment and rate! :D