there is 3 ways to comlete rockets bace the first way is by hope i helped someone :)
you get it at team rockets hide out
On Pokemon Gold? SLOWPOKETAILS
bottom floor beat the little puzzle tile to get to it
Celdon city gym in the casino place behind the poster where the team rocket member is in front of.
use the direction pad and move your character through the base until you get to giovonni and battle him then leave, once again using the direction pad and moving your character.
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in the building beside the poke center,upstairs
Train your pokemon to a higher level.
you can catch one in team rockets hide out in the town before lake rage rage you go into the building that has an antena out side it that looks like a tree with no leaves
in team aquas hide out
you will get it from lance team rockets headquarter
There is no team rocket base in Blue Rescue team. Unless you name your team Team Rocket.